REXX Interface Programmer's Reference Guide · EMC Corporation Corporate Headquarters: Hopkinton, MA 01748-9103 1-508-435-1000 REXX Interface Programmer’s Reference Guide P/N 300-002-205

REXX Interface

Programmer’s Reference GuideP/N 300-002-205

REV A04

EMC CorporationCorporate Headquarters:

Hopkinton, MA 01748-9103

1-508-435-1000www.EMC.com

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Copyright © 2008 EMC Corporation. All rights reserved.

Published March, 2008

EMC believes the information in this publication is accurate as of its publication date. The information is subject to change without notice.

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All other trademarks used herein are the property of their respective owners.

REXX Interface Programmer’s Reference Guide

Contents

Preface

Chapter 1 IntroductionOverview............................................................................................ 10When to use the interface ................................................................ 11What are Host Component objects? ............................................... 12

Chapter 2 How to Use the InterfaceIntroduction ....................................................................................... 14EMCSRDFR function variables....................................................... 15EMCSRDFC function variables....................................................... 18Supported functions ......................................................................... 19

Function 01 – Retrieve Subsystem Object ........................20Function 02 – Submit Host Component Command .............21Function 03 - Get Command Status .........................................22Function 04 - Retrieve Command Output...............................22Function 06 – Retrieve Global Information Objects...............23Function 07 – Retrieve Serial# Objects.....................................23Function 08 – Retrieve SSID Objects ........................................24Function 09 – Retrieve Control Unit Objects ..........................24Function 10 – Retrieve Device Objects.....................................25Function 11 – Retrieve RDF Link Objects................................26Function 12 – Retrieve Director Objects ..................................27Function 13 – Wait Routine .......................................................27Function 14 – Retrieve RDF Group Object..............................28Function 15 – Retrieve RDF Group Statistics Objects............30Function 16 – Retrieve SRDFA Session Objects .....................31Function 17 – Retrieve Director Statistics Objects..................32

REXX Interface Programmer’s Reference Guide 3

Contents

Function 18 - Reply to Command ............................................ 34Function 19 - Dynamic RDF (DRDF) ....................................... 35Function 20 - Get Device Identification................................... 36

Return codes ...................................................................................... 37Example programs............................................................................ 45Object headers ................................................................................... 48

OBJECTH formatted .................................................................. 48OBJECTH unformatted.............................................................. 48

Chapter 3 REXX VariablesIntroduction....................................................................................... 50Unformatted variables ..................................................................... 51Formatted variables.......................................................................... 52Formatted variable and object cross-reference ............................. 53

Index

REXX Interface Programmer’s Reference Guide4

Preface

As part of an effort to improve and enhance the performance and capabilities of its product line, EMC periodically releases revisions of the EMC Enginuity Operating Environment. Therefore, some functions described in this guide may not be supported by all versions of Enginuity currently in use. For the most up-to-date information on product features, refer to your product release notes.

If a feature does not function properly or does not function as described in this guide, please contact your EMC representative.

Note: This document is accurate at the time of publication. However, as information is added, new versions of this document will be released to the EMC Powerlink website at http://Powerlink.EMC.com. Check the Powerlink website to ensure that you are using the latest version of this document.

Audience This document is intended for experienced programmers, particularly those who have knowledge of REXX and EMC SRDF operation, configuration, and control. The manual describes the REXX interface.

Relateddocumentation

Related documents include:

◆ EMC ResourcePak Base for z/OS Product Guide

◆ EMC SRDF Host Component for z/OS Product Guide

◆ EMCSPE Programmer’s Reference Guide


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Preface

Conventions used inthis guide

EMC uses the following conventions for notes and cautions.

Note: A note presents information that is important, but not hazard-related.

CAUTION!A caution contains information essential to avoid data loss or damage to the system or equipment. The caution may apply to hardware or software.

Typographical conventionsEMC uses the following type style conventions in this document:

Normal Used in running (nonprocedural) text for:• Names of interface elements (such as names of windows,

dialog boxes, buttons, fields, and menus)• Names of resources, attributes, pools, Boolean expressions,

buttons, DQL statements, keywords, clauses, environment variables, functions, utilities

• URLs, pathnames, filenames, directory names, computer names, filenames, links, groups, service keys, file systems, notifications

Bold Used in running (nonprocedural) text for:• Names of commands, daemons, options, programs,

processes, services, applications, utilities, kernels, notifications, system calls, man pages

Used in procedures for:• Names of interface elements (such as names of windows,

dialog boxes, buttons, fields, and menus)• What user specifically selects, clicks, presses, or types

Italic Used in all text (including procedures) for:• Full titles of publications referenced in text• Emphasis (for example a new term)• Variables

Courier Used for:• System output, such as an error message or script • URLs, complete paths, filenames, prompts, and syntax when

shown outside of running text

Courier bold Used for:• Specific user input (such as commands)

Courier italic Used in procedures for:• Variables on command line• User input variables


Preface

Where to get help EMC support, product, and licensing information can be obtained as follows.

Product information — For documentation, release notes, software updates, or for information about EMC products, licensing, and service, go to the EMC Powerlink website (registration required) at:

http://Powerlink.EMC.com

Technical support — For technical support, go to EMC Customer Service on Powerlink. To open a service request through Powerlink, you must have a valid support agreement. Please contact your EMC sales representative for details about obtaining a valid support agreement or to answer any questions about your account.

Your comments Your suggestions will help us continue to improve the accuracy, organization, and overall quality of the user publications. Please send your opinion of this guide to:

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< > Angle brackets enclose parameter or variable values supplied by the user

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... Ellipses indicate nonessential information omitted from the example


http://powerlink.emc.com

8

Preface


1Invisible Body Tag

This chapter provides an overview of the REXX interface. The topics are:

◆ Overview............................................................................................. 10◆ When to use the interface.................................................................. 11◆ What are Host Component objects? ................................................ 12

Introduction

Introduction 9

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Introduction

OverviewThe IBM REXX programming language is a versatile, general-purpose language that can be used by both novice and experienced programmers. Using the SRDF® Host Component API support for REXX, you can control SRDF functionality rather than interact solely through a console. With REXX support, you can:

◆ Create scripts to automate procedures such as those found in the EMC SRDF Host Component for z/OS Product Guide.

◆ Build your own automation composite commands.

The REXX interface provides a callable assembler interface which populates REXX variables for the calling REXX program.

The purpose of the interface is to provide access through REXX programs to Host Component data. By providing clearly defined functions and sample code, a user interface can be developed in a short amount of time.

The REXX interface provides the following:

◆ An interface program named EMCSRDFR and a conversion and variable formatter called EMCSRDFC.

Note: The EMCSRDFC conversion program has access to only a small subset of the existing variables. EMCSRDFC will be removed from the next release of the REXX interface and will no longer be available.

◆ A series of functions which can be used to populate raw data objects which can be interrogated or interpreted as needed.

◆ The ability to submit Host Component commands through the interface and receive the output associated with the command.

◆ A conversion routine to convert the returned raw data into predefined formatted REXX variables.


Introduction

When to use the interfaceUse the REXX interface when:

◆ You need to build customized reports and/or commands.

◆ You need to automate procedures and would like more flexibility and functionality than SPE (Stored Procedure Exec) provides.

◆ You need custom decision making and command execution in a manual or automated environment.

When to use the interface 11

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Introduction

What are Host Component objects?The objects that are returned by the REXX interface are strings of data that can be interrogated or interpreted as needed. To do this, EMC provides object interpretation code that is ready to be included in your REXX program. This code sub-strings the returned object and interprets various fields. The code can be found in the product SCF SAMPLIB (distributed with EMC® ResourcePak® Base). The members begin with OBJECT and end with the function number. For example, to use the Function 01 object code, select OBJECT01.

You may choose to use these interpretation objects directly, use only a portion of them, or not use them at all. If you choose not to use the interpretation code, you are responsible for interpreting the fields within the objects yourself.

Since an object represents a string of data, you can select a single field or multiple fields to be interpreted or interrogated.


2Invisible Body Tag

This chapter describes the elements of the REXX interface. The topics are:

◆ Introduction ........................................................................................ 14◆ EMCSRDFR function variables........................................................ 15◆ EMCSRDFC function variables........................................................ 18◆ Supported functions .......................................................................... 19◆ Return codes ....................................................................................... 37◆ Example programs............................................................................. 45◆ Object headers .................................................................................... 48

How to Use theInterface

How to Use the Interface 13

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How to Use the Interface

IntroductionThe REXX interface provides callable functions which retrieve object data.

◆ EMCSRDFR

EMCSRDFR is called from a REXX program to build the Host Component data object.

Within your REXX program, you must set the appropriate REXX variables to values corresponding to the function you would like to invoke and call EMCSRDFR to retrieve the object output. Table 3 on page 19 lists the available functions.

◆ EMCSRDFC

EMCSRDFC is a conversion and variable formatter that converts the raw data returned object to formatted REXX variables.

You can build formatted REXX variables by calling EMCSRDFC immediately after EMCSRDFR returns with a good condition code. EMCSRDFC will use the newly built object records and build the predefined, formatted REXX variables.




EMCSRDFR function variablesTable 1 lists the input variables for the supported functions.

Table 1 EMCSRDFR function input variables (page 1 of 2)

Variable Description

EMCSRDF_COMMAND This variable is used to store the Host Component command to be executed. It is only used by Function 02 (Submit Host Component Command).

EMCSRDF_CPFX8 This variable contains a command prefix.The prefix must be left-justified, padded with blanks, and 8 characters in length.

EMCSRDF_DEVCOUNT This variable represents the number of devices requested. It must be a decimal value from 1 to 9999.

EMCSRDF_DEVFLAG This variable is used by Function 10 to request that the RDF Mirror flags be populated. Set this variable to M to request the mirror flags. Since this request results in additional overhead, you should only use this option when necessary.

EMCSRDF_FC This variable contains the function number to execute.

EMCSRDF_INCLUDE_RD10MBRS

This variable is used by Function 10 to request that the RAID 10 member device objects be returned. Set this variable to Y to retrieve RAID 10 member devices.

EMCSRDF_RDFGRPS This is an optional variable to be used for remote requests. It contains 1 or more multi-hop groups to a maximum of 8 (for example, 1.2.3.4.5.6.7.8).

EMCSRDF_REQ_TOKN This variable is used as an input variable to Function 18 (Reply to Command). This variable will be set when Function 03 or 04 returns a code 92, which indicates the command is waiting for a reply.

EMCSRDF_SELGROUP This is an optional variable used by Function 10 and Function 14 to return data for a single group. Specify a 2-digit hex value.

EMCSRDF_SELSYM This variable must contain either a 12-digit serial number or a 4-digit hex value representing a gatekeeper device. If this variable contains a serial number, the control unit must have at least one device online.

EMCSRDF_STARTDEV This variable must contain a 4-digit hex value representing your starting Symmetrix device.

EMCSRDF_TOKEN This variable is set on return from Function 02 (Submit Host Component Command). If EMCSRDF_WAIT_FOR_COMMAND is set to Y, the token field is maintained internally. If EMCSRDF_WAIT_FOR_COMMAND is set to N, you will need to supply this variable when you issue Function 03 (Get Command Status). This variable must also be supplied for Function 04 (Retrieve Command Output) and Function 18 (Reply to Command).

EMCSRDFR function variables 15

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EMCSRDF_TRK# This command tracking variable is set on return from Function 02 (Submit Host Component Command). It must be supplied as an input variable for Function 18.

EMCSRDF_USER_ VERIFY

When using Function 02 (Submit Host Component Command), set EMCSRDF_USER_VERIFY=Y to prevent the WTOR from appearing on the console and rerouting it to the application. When processing a command response in your application, if EMCSRDF_WAIT_FOR_COMMAND is set to Y, then EMCSRDFR will return code 92 from Function 02. If EMCSRDF_WAIT_FOR_COMMAND is not set to Y, EMCSRDFR will return code 92 from Function 03 or 04. When this happens, variable EMCSRDF_MSG will be set to the prompt that would have otherwise been sent in the WTOR.

To reply:• set EMCSRDF_USER_VERIFY= Y to allow the command to continue, or• set EMCSRDF_USER_VERIFY= N to deny the request • issue Function 18 (Reply to Command). To use this facility, the following must be specified in the Host Component init parameters:• USER_VERIFICATION=YES • USER_VERIFICATION_TIMEOUT=value• OPERATOR_VERIFY=value

EMCSRDF_WAIT This variable is only used by Function 13 (Wait Routine). It is used to specify the wait time in seconds.

EMCSRDF_WAIT_CMD_TIMEOUT

This is an optional variable for Function 02 (Submit Host Component Command). It can be set to hh:mm or to mmmm to specify a maximum amount of time to wait for the command to complete. When the time expires, Function 03 (Get Command Status) is executed and control is returned to the application with the return code value from Function 03.

EMCSRDF_WAIT_FOR_COMMAND

This is an optional variable for Function 02 (Submit Host Component Command).If set to Y, then Function 02 will wait for the command to complete. Upon completion of the command, Function 04 (Retrieve Command Output) will be executed internally. The return code to the application will reflect the return code from Function 04 and the EMCSRDF_LINE. variables will contain the command output.

Table 1 EMCSRDFR function input variables (page 2 of 2)




Table 2 lists the variables that may be set on return from the supported functions.

Table 2 EMCSRDFR function output variables


EMCSRDF_CMD_RC This variable contains the command return code. A non-zero return code indicates the command had an error.

EMCSRDF_DRDFRS This variable contains the reason code returned from Function 19 (Submit Dynamic RDF Command).

EMCSRDF_DRDFRTN_MESSAGE

This variable contains a text message indicating the reason for the DRDF (Dynamic RDF) error.

EMCSRDF_LINE.n This is a stem variable, with EMCSRDF_LINE.0 containing the number of command line records returned.

EMCSRDF_MESSAGE. This is a stem variable, with EMCSRDF_MESSAGE.0 containing the number of message records returned. It may contain data when EMCSRDF_RC is non-zero.

EMCSRDF_MSG This variable will be set when a return code 92 is returned and will contain the prompt that would have otherwise been sent in the WTOR.

EMCSRDF_RC This variable contains the return code from EMCSRDFR and EMCSRDFC.

EMCSRDF_TRK# This command tracking variable is set on return from Function 02 (Submit Host Component Command). It must be supplied as an input variable for Function 18 (Retrieve Command Output).

EMCSRDFR function variables 17

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EMCSRDFC function variables


EMCSRDFC requires no input variables. To build the predefined and formatted REXX variables for a particular function, call EMCSRDFC immediately after a successful function call. Upon a successful return from EMCSRDFC, the REXX variables will be available.

◆ EMCSRDF_RC - Contains the return code from EMCSRDFC



Supported functionsThe functions available via the REXX interface are listed in Table 3. In all cases, EMCSRDF_FC must contain the function number. Any required parameters will be listed along with a sample portion of the object interpretation code. The complete object interpretation code can be found in the SCF SAMPLIB distributed with the ResourcePak Base.

Output is returned from the interface via REXX Stem variables:

◆ The .0 variables will contain the number of .i records that were returned.

◆ The .i records will contain the unformatted objects.

Using the Object Interpretation Code, the object can be analyzed.

Table 3 Supported interface functions (page 1 of 2)

Function number Description

01 Retrieve Subsystem Object

02 Submit Host Component Command

03 Get Command Status

04 Retrieve Command Output

06 Retrieve Global Information Object

07 Retrieve Serial# Objects

08 Retrieve SSID Objects

09 Retrieve Control Unit Objects

10 Retrieve Device Objects

11 Retrieve RDF Link Objects

12 Retrieve Director Objects

13 Wait Routine

14 Retrieve RDF Group Objects

15 Retrieve RDF Group Statistics Objects

16 Retrieve SRDFA Session Objects

17 Retrieve Director Statistics Objects

Supported functions 19

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Function 01 – Retrieve Subsystem Object This function requires no input variables.

Returned objects The returned object(s) will be found in the following variables:

◆ EMCSRDF_SUBSYS.0

◆ EMCSRDF_SUBSYS.i

Sample objectinterpretation code

REXX - Function 01 - Subsys Object

sub_0001 =SUBSTR(subsys_rec, 1,4) /* Subsystem Name */sub_0002 =SUBSTR(subsys_rec, 5,2) /* Command character(s) */sub_0003 =SUBSTR(subsys_rec, 7,3) /* HC VERSION (VVRRMM) */sub_0004 =SUBSTR(subsys_rec,10,8) /* 8 CHARACTER CMD PFX */

18 Reply to Command

19 Submit Dynamic RDF (DRDF) Command

20 Get Device Information

Table 3 Supported interface functions (page 2 of 2)

Function number Description



Function 02 – Submit Host Component Command This function requires the following additional variables to be set:

◆ EMCSRDF_CPFX8

◆ EMCSRDF_COMMAND

Optionally, the following variables may also be set:

◆ EMCSRDF_WAIT_FOR_COMMAND

◆ EMCSRDF_WAIT_CMD_TIMEOUT

◆ EMCSRDF_USER_VERIFY

On return the following variables may be set:

◆ EMCSRDF_TOKEN

◆ EMCSRDF_LINE.

Returned objects This function does not return an object. When EMCSRDF_WAIT_FOR_COMMAND is set to "Y", Function 02 will wait for the command to complete. Upon completion of the command, Function 04 (Retrieve Command Output) will be executed internally. The return code to the application will reflect the return code from Function 04 and the output EMCSRDF_LINE. variables will contain the command output.

The EMCSRDF_LINE. variables look identical to console output, but issuing the command does not utilize console services. Any Host Component command can be submitted via the REXX interface provided the proper Host Component security has been granted.


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Function 03 - Get Command StatusThis function requires the following variables to be set:

◆ EMCSRDF_CPFX8

◆ EMCSRDF_TOKEN

Returned objects This function does not return an object. This is a control function that is used to test the completion of Function 02 (Submit Host Component Command). While this is a valid function to use, it is not used if EMCSRDF_WAIT_FOR_COMMAND is specified on Function 02. It is also not necessary if your application is designed to wait and issue Function 04. A return code of 0 from this function indicates the command is complete.

Function 04 - Retrieve Command OutputThis function requires the following variables to be set:

◆ EMCSRDF_CPFX8

◆ EMCSRDF_TOKEN

Returned objects This function does not return an object. This is a control function that is used to retrieve the output generated by Function 02. Command output will be contained in the stem variable EMCSRDF_LINE.n, with EMCSRDF_LINE.0 containing the number of stem variables returned.

A return code of 8 from this function indicates the command is not yet complete. At this point, you can issue a wait request (Function 13) and retry this function. Upon completion (return code of 0), this function sets variable EMCSRDF_CMD_RC to the return code for the command. This is a 4-byte binary number: 0 means the command worked, non-zero means the command had an error.



Function 06 – Retrieve Global Information ObjectsThis function requires the following variable to be set:

◆ EMCSRDF_CPFX8

Returned objects The returned object(s) will be found in the following variable:

◆ EMCSRDF_GLOBAL


REXX - Function 06 - Global Object

glb_0001 = C2X(SUBSTR(global_rec, 1,3)) /* HostComp version(vvrrmm) */glb_0002 = C2X(SUBSTR(global_rec, 4,3)) /* API version (vvrrmm) */glb_0003 =X2D(C2X(SUBSTR(global_rec, 7,2))) /* Msg processing table size*/glb_0004 =X2D(C2X(SUBSTR(global_rec, 9,2))) /* Max query */..glb_0023 = SUBSTR(global_rec,84,1) /* Command Prefix Registered*/

Function 07 – Retrieve Serial# ObjectsThis function requires the following variable to be set:

◆ EMCSRDF_CPFX8


◆ EMCSRDF_SERIAL.0

◆ EMCSRDF_SERIAL.i


REXX - Function 07 - Symmetrix Serial Number Object

ser#_0001 = SUBSTR(serial_rec, 1,12) /* Symm Serial Number */ser#_0002 = C2X(SUBSTR(serial_rec,13,2)) /* Major Micro Code Level */ser#_0003 = C2X(SUBSTR(serial_rec,15,2)) /* Minor Micro Code Level */


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Function 08 – Retrieve SSID ObjectsThis function requires the following variable to be set:

◆ EMCSRDF_CPFX8


◆ EMCSRDF_SSID.0

◆ EMCSRDF_SSID.i


REXX - Function 08 - SSID Object

ssid_0001 = C2X(SUBSTR(ssid_rec, 1,2)) /* SSID */ssid_0002 =X2D(C2X(SUBSTR(ssid_rec, 3,2)))/* number of devices */ssid_0003 = C2X(SUBSTR(ssid_rec, 5,1)) /* SSID Flags */ssid_0004 = C2X(SUBSTR(ssid_rec, 6,1)) /* Reserved */ssid_0005 = C2X(SUBSTR(ssid_rec, 7,2)) /* MVS dev# of 1st device found */ssid_0006 = C2X(SUBSTR(ssid_rec, 9,2)) /* Symmetrix dev# of 1st dev found */ssid_0007 = C2X(SUBSTR(ssid_rec,11,2)) /* MVS dev# of last device found */ssid_0008 = C2X(SUBSTR(ssid_rec,13,2)) /* Symmetrix dev# of last dev found */

Function 09 – Retrieve Control Unit ObjectsThis function requires the following variable to be set:

◆ EMCSRDF_CPFX8


◆ EMCSRDF_CNTLUNIT.0

◆ EMCSRDF_CNTLUNIT.i


REXX - Function 09 - Cntlunit Object

cntl_0001 = SUBSTR(cntlu_rec,1,64) /* Director map */cntl_0002 = SUBSTR(cntlu_rec,65,512) /* 64 RA grouping maps */cntl_0003 =RIGHT(STRIP(X2D(C2X(SUBSTR(cntlu_rec,577,4))),"L","0"),8)/* Mem MB */cntl_0004 = C2X(SUBSTR(cntlu_rec,581,2)) /* Control unit type */cntl_0005 = C2X(SUBSTR(cntlu_rec,583,4)) /* Microcode level */..cntl_0017 = SUBSTR(cntlu_rec,929,8) /* Reserved */



Function 10 – Retrieve Device ObjectsThis function requires the following variables to be set:

◆ EMCSRDF_CPFX8

◆ EMCSRDF_SELSYM

◆ EMCSRDF_STARTDEV

◆ EMCSRDF_DEVCOUNT

Optionally, the following variables may be set:

◆ EMCSRDF_RDFGRPS

◆ EMCSRDF_SELGROUP

◆ EMCSRDF_INCLUDE_RD10MBRS


◆ EMCSRDF_DEVICE.0

◆ EMCSRDF_DEVICE.i

Function 10 will also return BCV information, if available. This data will be contained in the following variables:

◆ EMCSRDF_DEVICE.i.BCVINFO.0

◆ EMCSRDF_DEVICE.i.BCVINFO.i


REXX - Function 10 - Device Object

dev_0001 = C2X(SUBSTR(devobj_rec, 1,4)) /* UCB address */dev_0002 = SUBSTR(devobj_rec, 5,1) /* Device flag byte 1 */dev_0003 = SUBSTR(devobj_rec, 6,6) /* volume serial */..dev_00102= SUBSTR(devobj_rec,270,12) /* RAID5 Member8 */


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Function 11 – Retrieve RDF Link ObjectsThis function requires the following variables to be set:

◆ EMCSRDF_CPFX8

◆ EMCSRDF_SELSYM

Optionally, the following variable may be set:

◆ EMCSRDF_RDFGRPS


◆ EMCSRDF_LINK.0

◆ EMCSRDF_LINK.i


REXX - Function 11 - Link Object

lnk_0001 =X2D(C2X(SUBSTR(link_rec, 1,4))) /* Total # IOs */lnk_0002 =X2D(C2X(SUBSTR(link_rec, 5,1))) /* Director # */lnk_0003 = SUBSTR(link_rec, 6,1) /* Director Type */lnk_0004 = SUBSTR(link_rec, 7,1) /* Other Side Director # */..lnk_0022 = SUBSTR(link_rec,46,2) /* Other Side group mask */



Function 12 – Retrieve Director ObjectsThis function requires the following variables to be set:

◆ EMCSRDF_CPFX8

◆ EMCSRDF_SELSYM


◆ EMCSRDF_RDFGRPS


◆ EMCSRDF_DIRECTOR.0

◆ EMCSRDF_DIRECTOR.i


REXX - Function 12 - Director Object

dir_0001 =X2D(C2X(SUBSTR(dir_rec,1,1))) /* Director # */dir_0002 = SUBSTR(dir_rec,2,1) /* Director type */dir_0003 = SUBSTR(dir_rec,3,1) /* Director Online flag */dir_0004 = SUBSTR(dir_rec,4,1) /* Director Connected flag */

Function 13 – Wait RoutineThis function requires the following variable to be set:

◆ EMCSRDF_WAIT

Returned objects This function does not return an object. This is a control function which is used to force a wait interval to be executed. The variable EMCSRDF_WAIT must be primed with the amount of seconds to wait. When using Function 2 (Submit Host Component Command), this function is essential to delay the command complete checking.


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Function 14 – Retrieve RDF Group ObjectThis function requires the following variables to be set:

◆ EMCSRDF_CPFX8

◆ EMCSRDF_SELSYM

Optionally, the following variables may be set:

◆ EMCSRDF_RDFGRPS

◆ EMCSRDF_SELGROUP


◆ EMCSRDF_RDFGROUP.0

◆ EMCSRDF_RDFGROUP.i

◆ EMCSRDF_RDFGROUPi_STARLCL

◆ EMCSRDF_RDFGROUPi_STARRMT

◆ EMCSRDF_RDFGROUPi_MSCLCL

◆ EMCSRDF_RDFGROUPi_BOXLIST.0

◆ EMCSRDF_RDFGROUPi_BOXLIST.#


REXX - Function 14 - RDF Group Object

grp_0001 =X2D(C2X(SUBSTR(rdfgrp_rec, 1,1))) /* RDF Group */grp_0002 =X2D(C2X(SUBSTR(rdfgrp_rec, 2,1))) /* Other Side RDF Group */grp_0003 = SUBSTR(rdfgrp_rec, 3,12) /* Other Side Serial # */grp_0004 =X2D(C2X(SUBSTR(rdfgrp_rec,15,2))) /* Other Side major rel. */grp_0018 = SUBSTR(rdfgrp_rec,56,10) /* Label */

REXX - Function 14 - STAR Local object /******************************************************************************/lcl_00001= SUBSTR(starl_rec, 1,1) /* SRDFA TYPE */lcl_00002= SUBSTR(starl_rec, 2,1) /* SRDFA ACTIVE */lcl_00003= SUBSTR(starl_rec, 3,1) /* SRDFA TOLERANCE */lcl_00004= SUBSTR(starl_rec, 4,1) /* CLEANUP RUNNING */..lcl_00056=X2D(C2X(SUBSTR(starl_rec,137,4))) /* # SECONDS SINCE */



REXX - Function 14 - STAR Remote objectrmt_00001= SUBSTR(starr_rec, 1,1) /* SRDFA TYPE */rmt_00002= SUBSTR(starr_rec, 2,1) /* SRDFA ACTIVE */rmt_00003= SUBSTR(starr_rec, 3,1) /* SRDFA TOLERANCE */rmt_00004= SUBSTR(starr_rec, 4,1) /* CLEANUP RUNNING */..rmt_00056=X2D(C2X(SUBSTR(starl_rec,137,4))) /* # SECONDS SINCE */

REXX - Function 14 - Group MSC Information/******************************************************************************/msl_00001= SUBSTR(mscl_rec, 1,1) /* Version 0-MSC 1-MSC/STAR*/msl_00002= SUBSTR(mscl_rec, 2,1) /* List complete */msl_00003= SUBSTR(mscl_rec, 3,1) /* MVS defined */msl_00004= SUBSTR(mscl_rec, 4,1) /* OS defined */..msl_00019= SUBSTR(mscl_rec, 33,16) /* Reserved */

REXX - Function 14 - Box List Information/******************************************************************************/box_00001= SUBSTR(box_rec, 1,12) /* Primary side Ser# */box_00002= C2X(SUBSTR(box_rec, 13,1)) /* Primary side Group */box_00003= SUBSTR(box_rec, 14,12) /* Secondary side Ser# */box_00004= C2X(SUBSTR(box_rec, 26,1)) /* Secondary side Group */box_00005= SUBSTR(box_rec, 27,6) /* Reserved */


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Function 15 – Retrieve RDF Group Statistics ObjectsThis function requires the following variables to be set:

◆ EMCSRDF_CPFX8

◆ EMCSRDF_SELSYM


◆ EMCSRDF_RDFGRPS


◆ EMCSRDF_RGRPSTAT.0

◆ EMCSRDF_RGRPSTAT.i


REXX - Function 15 - Rgrpstat Object

grs_0001 =X2D(C2X(SUBSTR(rgrpst_rec, 1,1))) /* RDF Group */grs_0002 =X2D(C2X(SUBSTR(rgrpst_rec, 2,1))) /* This side director # */grs_0003 = C2X(SUBSTR(rgrpst_rec, 3,1)) /* Config flags */grs_0004 = C2X(SUBSTR(rgrpst_rec, 4,1)) /* Protocol */..grs_0016 =X2D(C2X(SUBSTR(rgrpst_rec,35,8))) /* Data in counter */



Function 16 – Retrieve SRDFA Session Objects

Note: Function 16 is no longer supported. Use “Function 14 – Retrieve RDF Group Object” on page 28 to obtain SRDFA/STAR/MSC information.


32


Function 17 – Retrieve Director Statistics ObjectsThis function requires the following variables to be set:

◆ EMCSRDF_CPFX8

◆ EMCSRDF_SELSYM


◆ EMCSRDF_RDFGRPS


◆ EMCSRDF_DSTAT.0

◆ EMCSRDF_DSTAT.i

Note: The Format field must be checked to determine the format of the object.


REXX - Function 17 - Director Statistics Object

sta_0001 =X2D(C2X(SUBSTR(stat_rec, 1,1))) /* Format */sta_0002 =X2D(C2X(SUBSTR(stat_rec, 2,1))) /* Director Type */sta_0003 =X2D(C2X(SUBSTR(stat_rec, 3,1))) /* Director # */sta_0004 = SUBSTR(stat_rec, 4,13) /* Reserved */sta_rec = SUBSTR(stat_rec,17,256) /* Director Statistics Info */

Format 2 director type EA

ea_0001 =X2D(C2X(SUBSTR(sta_rec, 1,4))) /* Number of writes */..ea_0007 =X2D(C2X(SUBSTR(sta_rec,25,4))) /* Device write pendings */

Format 3 director type SA

sa_0001 =X2D(C2X(SUBSTR(sta_rec, 1,4))) /* Number of writes */..sa_00011 =X2D(C2X(SUBSTR(sta_rec,41,4))) /* Device write pendings */

Format 4 director type FA

fa_0001 =X2D(C2X(SUBSTR(sta_rec, 1,4))) /* Number of writes */..fa_00011 =X2D(C2X(SUBSTR(sta_rec,41,4))) /* Device write pendings */



Format 6 director type DA

da_0001 =X2D(C2X(SUBSTR(sta_rec, 1,4))) /* Number of I/O's */..da_00013 =X2D(C2X(SUBSTR(sta_rec,49,4))) /* Average fall thru time */

Format 7 director type RF

rf_0001 =X2D(C2X(SUBSTR(sta_rec, 1,4))) /* Number of I/O's */..rf_00014 =X2D(C2X(SUBSTR(sta_rec,55,2))) /* Reserved */

Format 11 director type SE

se_0001 =X2D(C2X(SUBSTR(sta_rec, 1,4))) /* Number of writes */..se_00011 =X2D(C2X(SUBSTR(sta_rec,41,4))) /* Device write pendings */


34


Function 18 - Reply to CommandThis is a control function that does not produce an object. This function is used after a command has indicated that a reply is outstanding. If the variable EMCSRDF_USER_VERIFY is set to Y, the command will be executed. If EMCSRDF_USER_VERIFY is set to N, the command will be denied.

This function requires that the following variables be set:

◆ EMCSRDF_CPFX8

◆ EMCSRDF_TOKEN

◆ EMCSRDF_REQ_TOKN

◆ EMCSRDF_TRK#



Function 19 - Dynamic RDF (DRDF)This is a synchronous request and does not return control to the caller until the command is complete. It accepts a valid SRDF Host Component SC VOL command with a valid dynamic RDF action (createpair, deletepair, swap, hdeletepair, and hswap).

The syntax requirements for this command are the same as if the command were entered directly to the host component. The actual dynamic RDF work is performed in SCF via a new function in the mainframe Symmetrix® API. This function uses some of the Host Component common services and requires that Host Component be active.

Command output looks identical to console output, but issuing the command does not utilize console services. Only the SC VOL (DRDF) command can be submitted via this function and proper Host Component security is required.

This function requires that the following variables be set:

◆ EMCSRDF_CPFX8

◆ EMCSRDF_COMMAND

Returned objects This function does not return an object. It returns formatted command output. Command output will be contained in the stem variable EMCSRDF_LINE.n, with EMCSRDF_LINE.0 containing the amount of stem variables returned.


36


Function 20 - Get Device IdentificationThis function returns object 20, which contains device-specific information. This function requires that the following additional variables be set:

◆ EMCSRDF_CPFX8

◆ EMCSRDF_SELSYM

Must contain a 4-character MVS CUU. Use of a Symmetrix serial number is not supported.

There are no optional variables that can be used.


◆ EMCSRDF_DEVICEID.0

◆ EMCSRDF_DEVICEID.i


/* REXX - Function 20 - Device Identification Object */

did_0001 = SUBSTR(didobj_rec,1 ,12) /* Symm Serial Number */..did_0031 = C2X(SUBSTR(didobj_rec,67 ,2)) /* BASE SYMDEV# */



Return codesThis section provides a list of possible REXX return codes. You should check EMCSRDF_RC in addition to the return code from the call or link to EMCSRDFR and EMCSRDFC.

◆ Table 4 shows the return codes from EMCSRDFR.

◆ Table 5 on page 39 shows the return codes from EMCSRDFC.

◆ Table 6 on page 39 lists the dynamic RDF (DRDF) reason codes.

Table 4 Return codes from EMCSRDFR (page 1 of 3)

Return code Description

0 Success.

4 Command complete.

8 Command not complete.

12 Command not found.

16 Max commands queued.

20 Host Component not accepting commands.

24 Unable to locate Host Component subsystem command prefix. Check that this subsystem is running.

28 Bad function code passed.

32 Invalid starting device.

36 Unable to initiate cross memory interface.

40 Unable to terminate cross memory interface.

44 Getmain failed.

48 Requested object failed validation.

52 I/O error (API error).

56 Abend occurred in cross memory.

60 Request to queue command failed.

64 Requested Symmetrix below minimum microcode level.

68 Unable to locate UCB.

Return codes 37

38


72 Unexpected condition.

76 SCF Not Found (Server Address Space).

80 EMCSRDF_COMMAND is equal to null or blank.

84 Version error.

88 Bad RDFGRP passed.

92 Command waiting to be verified.

96 The UCB check for this device has failed.

100 The RDF group specified was not found.

104 The RDF group specified is invalid.

108 Control unit not found.

112 Discover command timed out.

116 Bad command timeout specified.

120 Error retrieving the REXX variables.

124 Error setting the REXX variables.

128 Error validating the REXX environment.

132 Command parse error.

136 Access denied.

140 Invalid command length.

144 DRDF failed to change the RDF relationship. See EMCSRDF_DRDFRS for the reason code. EMCSRDF_DRDFRTN_MESSAGE will contain the message text.

148 DRDF Symmetrix commands to sync RDF pairs failed. See EMCSRDF_DRDFRS for the reason code. EMCSRDF_DRDFRTN_MESSAGE will contain the message text.

152 DRDF API error. See EMCSRDF_DRDFRS for the reason code. EMCSRDF_DRDFRTN_MESSAGE will contain the message text.





The following reason codes will be reflected in the REXX variable EMCSRDF_DRDFRS as shown in Table 6.

156 MVS device number not specified.

160 Remote request not allowed.

164 SCF maintenance level too low.

Table 5 Return codes from EMCSRDFC


08 Unable to determine the number of entries for stem variable.

12 Processing routine error.



Table 6 Dynamic RDF (DRDF) reason codes (page 1 of 6)

Reason code Description

1 INVALID MULTI-HOP LIST SPECIFIED

2 INVALID RDF GROUP SPECIFIED

3 DYNAMIC RDF NOT SUPPORTED ON LOCAL SYMMETRIX

4 DYNAMIC RDF NOT SUPPORTED ON REMOTE SYMMETRIX

5 LOCAL DEVICE(S) INVALID

6 REMOTE DEVICE(S) INVALID

7 LOCAL DEVICE NOT CAPABLE

8 REMOTE DEVICE NOT CAPABLE

9 LOCAL DEVICE NEITHER R1 NOR R2

10 REMOTE DEVICE NEITHER R1 NOR R2

11 LOCAL AND REMOTE DEVICES BOTH R1 OR BOTH R2

12 SWAP WITH DIFFERENT SIZE DEVICES

13 SWAP WITH LOCAL CONCURRENT R1

14 SWAP WITH REMOTE CONCURRENT R1

Return codes 39

40


15 TF/SNAP LOCK ON LOCAL DEVICE

16 TF/SNAP LOCK ON REMOTE DEVICE

17 LOCAL DEVICE(S) IN USE BY ANOTHER PROCESS

18 REMOTE DEVICE(S) IN USE BY ANOTHER PROCESS

19 FBA META DISCOVERY OVERFLOW

20 FBA META DEVS CALL FAILED

21 DEVICE COUNT IS ZERO

22 DEVICE STATUS CALL FAILED

23 RDF PAIR IS READY ON THE LINK

24 LOCAL DEVICE HAS INVALID TRACKS, FORCE NOT SPECIFIED

25 REMOTE DEVICE HAS INVALID TRACKS, FORCE NOT SPECIFIED

26 FBAMETA LOCAL DEVICE CB INVALID

27 FBAMETA REMOTE DEVICE CB INVALID

28 FBAMETA INVALID RUN

29 FBAMETA MEMBERS ARE DIFFERENT SIZES

30 FBAMETA HEAD NOT IN RUN

31 FBAMETA MISMATCHED MEMBERS

32 FBAMETA STRIPE SIZE MISMATCH

33 FBAMETA TOO MANY RUNS GENERATED

34 FBAMETA CB IS INVALID

35 FBAMETA MEMBER HAS INVALID TRACKS, FORCE NOT SPECIFIED

36 LOGIC ERROR

37 R2 IS ALREADY RDF

38 R1 IS ALREADY RDF AND DYNAMIC CONCURRENT NOT SUPPORTED





39 R1 IS ALREADY RDF IN SPECIFIED GROUP

40 R1 IS ALREADY CONCURRENT RDF

41 LOCAL DEVICE NOT CAPABLE OF BECOMING SPECIFIED TYPE

42 REMOTE DEVICE NOT CAPABLE OF BECOMING SPECIFIED TYPE

43 MISMATCHED EMULATION

44 R2 CANNOT BE LARGER THAN R1

45 ALL MIRROR POSITIONS IN USE FOR LOCAL DEVICE

46 ALL MIRROR POSITIONS IN USE FOR REMOTE DEVICE

47 GROUP NOT SPECIFIED FOR CONCURRENT R1

48 RDF-SUSPEND PARAMETER ERROR IN RUN

49 RDF-SUSPEND FAILED

50 REMOTE SERIAL# INVALID

51 DEVICE RANGE IS TOO LARGE

52 DEVICE NUMBER IS INVALID

53 ACTION FAILED FOR DEVICE

54 RDF PAIR NOT SUSPENDED

55 BAD RDF GROUP SPECIFIED

56 DEVICE ALREADY RDF

57 RDF POLARITY ERROR

59 DEVICES NOT DYNAMIC

60 UNDO ACTION FAILED

61 MICROCODE LEVEL TOO LOW

62 DYNRDF INTERNAL ERROR

63 CONCURRENT RDF DEVS FOUND

64 FARPOINT NOT ALLOWED



Return codes 41

42


65 INVALID FLAGS REQUESTED

66 DEVICE HELD FOR TF SNAP

67 INVALID MULTI-EXECUTE MASK

68 SPLIT CE+DE NOT ALLOWED

69 PPRC COPY DIRECTION NOT SET

70 PAIR MISMATCH

71 DRDF RAID_S NOT SUPPORTED

72 PPRC RE-ESTABLISH NO R1

73 PPRC R1 NOT TNR

74 VAULT DEVICE CANNOT BE R2

75 CONFIG MISMATCH

76 FBA META MISMATCH

77 DUPLICATE DEVICE SPECIFICATION

78 SWAP R2 IS LARGER THAN R1

79 SYMMPURGE ACTIVE ON DEVICE

80 CANNOT SWAP PPRC DEVICES

81 DEVICE IN CONSISTENCY GROUP

82 ALREADY CONCURRENT RDF

83 RDF MIRROR EXISTS IN GROUP

84 RDF FLAGS MISMATCH

85 R2 ALREADY RDF

86 ALREADY RDF DEVICE

87 SWAP NOT ALLOWED IN SRDFA GROUP

88 SWAP WITH WRITE PENDINGS

89 TOLERANCE OR CEXMPT NOT SET





90 SRDF/A MIXED RDF DEVICES

91 NO PPRC WITH SRDF/A

92 NO CONCURRENT SRDF/A MIRRORS

93 SRD/FA ACTIVATION LOCK HELD

94 DEVICE IS XRC

95 SRDF/A I/Os OUTSTANDING

96 R2 RESTORE NOT COMPLETE

97 CLEANUP RUNNING

98 NO CONCURRENT DRDF ON BCV

99 SRDF/A STATE TABLE LOCKED

100 DEV# TOO HIGH FOR RA

101 GROUP IS STAR MODE

102 CKD META MIRROR MASK CONFLICT

103 INCONSISTENT SYSCALL RUN

104 R21 DEVICE WILL RESULT BUT ADCOPY_DISK NOT SPECIFIED

105 R21 DEV WILL RESULT BUT CASCADED SRDF NOT LICENSED

106 MOVEPAIR DENIED, SRDF/A ACTIVE ON TARGET RDF GROUP

201 OTHER PROCESS LOCK QUERY FAILED

202 TF/SNAP LOCK QUERY FAILED

203 TF/SNAP LOCK FREE FAILED

299 SYSCALL ERROR

300 INVALID LOCAL DEVICE IN RANGE

301 INVALID REMOTE DEVICE IN RANGE

302 SPECIFIED GROUP DOES NOT MATCH EXISTING RDF MIRROR(S)

303 STARTING DEV# FOR RANGE IS BEYOND CNTLUNIT BOUNDARY



Return codes 43

44


304 ENDING DEV# FOR RANGE IS BEYOND CNTLUNIT BOUNDARY

305 ERROR CHECKING DEVICE STATUS

306 DEVICE DID NOT CHANGE TO EXPECTED STATE

307 EXISTING RDF MIRROR NOT TNR

308 DEVICE RANGE TOO HIGH FOR CONFIG

309 DATA SOURCE HAS NO FULLY VALID LOCAL MIRRORS

310 LCL DEV HAS ACTIVE TIMEFINDER DATASET SNAP

311 RMT DEV HAS ACTIVE TIMEFINDER DATASET SNAP

312 NUMBER OF RDF GROUPS EXCEEDS MAX

313 UNABLE TO DETERMINE REMOTE GROUP

999 FC21 ABEND ESTAE RECOVERY





Example programsThe sample programs provide examples of how to set up and call the Host Component REXX API. With the API, you can retrieve data objects for report or interrogation purposes and submit Host Component commands.

Before the Host Component REXX API samples can be used, you must copy them to the appropriate runtime datasets.

◆ The following sample REXX EXECs must be copied to the ResourcePak Base ISPELIB: APIC, APIR, APIT, APIV, CALLAPIC, CALLAPID, CALLAPIR, CALLAPIT, CALLAPIV, and APITEST.

◆ The following sample panels must be copied to the ResourcePak Base ISPPLIB: APIDP, APITP, HAPIR, and HAPIT.

Note: The clist and JCL members listed in Table 7 require site-specific tailoring. You will need to provide information such as the Host Component command prefix, the Host Component loadlib that contains both EMCSRDFR and EMCSRDFC, the SCF prefix, and possibly others.

The clist members below are actually short REXX setup programs which are used to invoke the sample programs. Each clist and JCL has its own unique requirements. The samples below are documented in the members themselves.

Table 7 lists and briefly describes the sample programs. These examples can be found in the installed SAMPLIB. These samples provide code which illustrates how to use each function and how to process the data returned from each function.

Table 7 Example programs (page 1 of 3)

Program Description

APIC A sample clist which invokes CALLAPIC.

APID A sample clist that invokes CALLAPID.

APIDP A sample panel used to produce the input to CALLAPID.

APIR A sample clist that invokes CALLAPIR.

APIT A sample clist that invokes CALLAPIT.

APITEST A sample program that uses the Host Component REXX API to illustrate how to build a user interface.

Example programs 45

46


APITP A sample panel used to produce the input to CALLAPIT and CALLAPIR.

APIV A sample clist that invokes CALLAPIV.

APIVJ A sample JCL member that invokes CALLAPIV.

CALLAPIC A sample program which calls APITEST and uses Function 2 to submit a command and Function 18 to respond to a command prompt.

CALLAPID A sample program that calls APITEST and uses the raw unformatted data to produce a custom object display command.

CALLAPIR A sample program that calls APITEST and uses the raw unformatted data to produce the desired results.

CALLAPIT A sample program that calls APITEST and uses the formatted REXX variables to produce a report similar to the SRDFR ISPF interface.

CALLAPIV A sample program that builds a custom display command. This REXX can run online or batch.

EHCJAPIS Sample JCL to invoke EHCXSEL.

EHCJSFxx JCL to execute the EHCXSF## sample programs.

EHCJXCFG Sample JCL to invoke EHCXSCFG.

EHCPHSEL Help panel for EHCPSEL.

EHCJXF19 Invokes EHCXSF19 in batch mode.

EHCPSEL A sample panel used to produce the input to EHCXSEL.

EHCXCSEL A sample REXX clist used to invoke EHCXSEL.

EHCXSCFG A sample program that shows how to build an auto configurator.

EHCXSEL A sample REXX program to build a custom select command for display. It takes as input a statement to parse and calls EMCSRDFR to retrieve device records. The records are filtered based on the supplied criterion and displayed. This sample can be invoked via a panel, JCL, or directly.

EHCXSF01 Sample program to execute Function 01.






Program Description











HAPIR The help panel for APIR.

HAPIT The help panel for APIT.


Program Description

Example programs 47

48


Object headersTo allow for expansion and modification of the objects without adversely affecting the applications using these objects, each object has an object header (OBJECTH). This header is used to identify the version of the object. The object header is available as formatted REXX variables and/or as unformatted records.

Note: OBJECTH in the product SAMPLIB contains the object interpretation code.

OBJECTH formatted

FC##.HDR_OBJECTIDFC##.HDR_FCFC##.HDR_VERSIONFC##.HDR_HDRLENFC##.HDR_OBJLEN

OBJECTH unformattedSample object interpretation code:

REXX - Object Header

hdr_0001 = SUBSTR(object_hdr,1 ,8) /* Object ID */hdr_0002 = SUBSTR(object_hdr,9 ,2) /* Function Code */hdr_0003 =X2D(C2X(SUBSTR(object_hdr,11,2))) /* Version */hdr_0004 =X2D(C2X(SUBSTR(object_hdr,13,2))) /* Header Length */hdr_0005 =X2D(C2X(SUBSTR(object_hdr,15,2))) /* Object Length */hdr_0006 =X2D(C2X(SUBSTR(object_hdr,17,16))) /* Unused */


3Invisible Body Tag

This chapter provides a cross-reference between the returned records and the formatted variables created by EMCSRDFC.

Note: The EMCSRDFC conversion program only has access to a small subset of the existing variables. EMCSRDFC will be removed from the next release of the REXX interface and will no longer be available.

◆ Introduction ........................................................................................ 50◆ Unformatted variables ...................................................................... 51◆ Formatted variables ........................................................................... 52◆ Formatted variable and object cross-reference .............................. 53

REXX Variables

REXX Variables 49

50

REXX Variables

IntroductionThe REXX interface provides access to Host Component variables returned as string data called objects. The interface can process Host Component commands and replies. The ready-to-use APITEST application illustrates example command usage. The REXX code to interpret the returned object can be found in the OBJECT## members.


REXX Variables

Unformatted variablesUse the .0 variable to determine how many records were generated. The value in this field is used to determine the number of the records in the stem as follows:

EMCSRDF_object_name.0 EMCSRDF_object_name.#

Where object_name is the object name and # is each instance of the object in the stem.

You can use the object interpretation code to format your own variables using these records.

Unformatted variables 51

52

REXX Variables

Formatted variablesSince EMCSRDFC is only called after a call to EMCSRDFR, the unformatted records are already created. EMCSRDFC will take these records and populate the REXX variables.

The object variables have the following format:

FC@@.#_variable_name

Where @@ is the object number, # is the record number, and variable_name is the name of the variable.

If you called the subsystem object routine, you would use EMCSRDF_SUBSYS.0 to determine how many objects were returned. For example, assume it is set to 2. The subsys object number is 01 and 2 records were returned. The variables created would be:

FC01.1_SUBSYS_NAME Contains the 1st subsystem name

FC01.1_CMD_CHARS Contains the 1st prefix characters

FC01.1_HCVER Contains the 1st SRDF Host Component version

FC01.2_SUBSYS_NAME Contains the 2nd subsystem name

FC01.2_CMD_CHARS Contains the 2nd prefix characters

FC01.2_HCVER Contains the 2nd SRDF Host Component version


REXX Variables

Formatted variable and object cross-referenceThis section provides a cross-reference between the returned records and the formatted variables created by EMCSRDFC. You can use the object interpretation members (OBJECTXX) in the product SAMPLIB in conjunction with this cross-reference to build custom applications.

Note: Formatted variable names are not available for all object fields. To ensure that you have access to all fields within each object, you should access the unformatted data fields using the OBJECT## members. You can then assign field names based on the descriptions provided to suit your needs.

Note that EMCSRDFC will be removed from the next release of the REXX interface and will no longer be available.

The following tables list the offset within the returned object along with the length of the field, the type of field (C=character, X=binary), and a brief description of the field.

Table 8 Function ALL, Object name: HEADER

Offset Length Type Formatted variable name Description

1 8 C FC@@.HDR_OBJECTID Object ID

9 2 C FC@@.HDR_FC Function code

11 2 X FC@@.HDR_VERSION Version

13 2 X FC@@.HDR_HDRLEN Header length

15 2 X FC@@.HDR_OBJLEN Object length

17 16 X Reserved

32 Object length

Where @@ is the function number.

Formatted variable and object cross-reference 53

54

REXX Variables

Table 9 Function 01, Object name: SUBSYS


1 4 C FC01.#_SUBSYS_NAME Subsystem name

5 2 C FC01.#_CMD_CHARS Command character(s)

7 3 X FC01.#_HCVER Host Component version (vvrrmm)

10 8 C FC01.#_CMD_CPFX8 8-character command prefix

18 7 X Reserved

24 Object length

Table 10 Function 06, Object name: GLOBAL (page 1 of 3)


1 3 X FC06._VERS Host Component version (vvrrmm)

4 3 X FC06._API_VERS API version (vvrrmm)

7 2 X FC06._MPTS Message processing table size

9 2 X FC06._MAXQ Max query

11 2 X FC06._MAXC Maxcmdq

13 4 C FC06._SUBSYS_NAME Subsystem name

17 2 C Reserved

19 8 C FC06._SAF_CLASS SAF class name

27 44 C FC06._SAF_RES SAF resource name


REXX Variables


71 1 X FC06._CSL Config security level 1-SAF 2-ANY 3-MASTER 4-SAF,MASTER

72 1 X FC06._QSL Query security level 1-SAF 2-ANY 3-MASTER 4-SAF,MASTER

73 1 C FC06._EXT_SAFFLG Extended SAF flag (Y|N)

74 1 X FC06._CSD Current synch direction 0-NONE 1-R1>R2 2-R1<R2

75 1 X FC06._ASD Allowed synch direction 0-NONE 1-R1>R2 2-R1<R2 3-R1<>R2

76 1 C FC06._MSG_PROC Message processing (Y|N)

77 1 C FC06._OV Operator verify A-ALL N-NO C-CRITICAL

78 1 C FC06._CFG_FBA Config FBA (Y|N)



56

REXX Variables


79 1 C FC06._MSGLBL Message Labels S-SYMM SERIAL# M-MVS CUU C-COMMAND# N-NOT SPECIFIED

80 1 C FC06._SHOW_CMD Show command on EMCMN00I (Y/N)

81 1 C FC06._ABORTGRP_CMD Abort command if subtask busy (Y/N)

82 1 C FC06._COMMAND_DETAILS

Command details (Y/N)

83 1 C FC06._SORT_BY Sort by 0-DFLT (BY SYMDV#) 1-SORT_BY_MVSCUU 2-SORT_BY_VOLSER 3-SORT_BY_COMMAND)

84 8 C FC06._CMD_PFX Command prefix chars

92 1 C FC06._CMD_PFXREG Command prefix registered (Y/N)

93 1 C User command verification (Y/N)

94 5 C User command verify timeout MM:SS

99 6 X Reserved

104 Object length



REXX Variables

Table 11 Function 07, Object name: SERIAL


1 12 C FC07.#_SERIAL_NBR Symmetrix serial number

13 2 X FC07.#_MCLVL_MAJ Major microcode level

15 2 X FC07.#_MCLVL_MIN Minor microcode level

16 Object length


58

REXX Variables

Table 12 Function 08, Object name: SSID


1 2 X FC08.#_SSID SSID

3 2 X FC08.#_NBR_DEVS Number of devices

5 1 X FC08.#_SSID_FLAGS

SSID Flags 80-EMC CONTROLLER 40-EMC SYM3 20-3990 10-PHY DEV# VALID 08-EMC SYM4 04-EMC SYM5 02-EMC SYM6 01-2105 (3990 will also be set)

6 1 X SSID Flags2 80-EMC SYM3 40-EMC SYM4 20-EMC SYM5 10-EMC SYM6 08-EMC SYM7

7 2 X FC08.#_FIRST_MVSDEV MVS device# of 1st device found

9 2 X FC08.#_LAST_MVSDEV MVS device# of last device found

11 2 X FC08.#_FIRST_SYMMDEV Symmetrix device# of 1st device found

13 2 X FC08.#_LAST_SYMMDEV MVS device# of last device found

15 12 C FC08.#_SYMSER Symmetrix serial number

27 6 X Reserved

32 Object length


REXX Variables

Table 13 Function 09, Object name: CNTLUNIT (page 1 of 3)


1 64 C FC09.#_DIR_MAP Director mapC-CA DIRECTOR E-EA DIRECTORD-DA DIRECTORS-SA DIRECTOR W-DAF DIRECTOR1-RA1 DIRECTOR2-RA2 DIRECTOR F-FIBER RA DIRECTORA-FIBRE SA G-FIBRE GIGE (RA MODE)I-FICON DIRECTORBLANK-UNUSED DIRECTOR

65 512 X FC09.#_RA_GRP_LIST 64 RA grouping mapsFor each RA group (0-63), contains an 8-byte list of director numbers associated with that RA group. Note that directors are numbered starting with 1. A director number of 0 terminates the list. If the 1st byte of a group map is 0, then there are no directors assigned to that group.

577 4 X FC09.#_MEM_MEG Memory MB

581 2 X FC09.#_CNTLU_TYPE Control unit type

583 4 X FC09.#_MC_LEVEL Microcode level (MAJOR/MINOR REL)

587 2 X FC09.#_NBR_VOLS Number of volumes

589 2 X FC09.#_GRP Number of RAID groups

591 12 C FC09.#_SERIAL# Serial number

603 1 X FC09.#_FLAG_BYTE1 Flag byte 04-LINKS-DOMINO02-T3 (EXTENDED) LINK


60

REXX Variables


604 1 X FC09.#_SYMM_TYPE Symmetrix type

605 1 C FC09.#_SYNC_DIR Sync direction 0-NONE 1-R1>R2 2-R1<R2 4-GLOBAL

606 1 X FC09.#_SSID.0 Number of SSIDs

607 256 C FC09.#_SSIDS Array of SSID entries

863 64 C FC09.#_RDFGRP_SYNCDIR RDF group sync directions0 - None1 - R1>R22 - R1<R24 - GLOBAL5 - CNFG

927 2 X Reserved

929 1 C FC09.#_RAID5 RAID 5 configured (Y/N)

930 1 C FC09.#_SRDFA SRDF/A supported (Y/N)

931 1 C RAID 6 configured (Y/N)

932 5 X Reserved

937 4 X Number of SSID2s

941 4 X Reserved

945 1024 X SSID2 array256 4-byte entries. The SSID is contained in the first two bytes of each entry.

1969 256 C RDF group sync directions0 - None1 - R1>R22 - R1<R24 - GLOBAL5 - CNFG

2225 4 X Reserved



REXX Variables


2229 2048 X RA group director list256 8-byte entries. Each entry contains a list of director numbers associated with that group. Director numbers start at 1. A director number of 0 terminates the list. If the 1st byte of an entry is 0, then no directors are associated with this group.

4277 4 X Reserved

4280 Object Length



62

REXX Variables

Table 14 Function 10, Object name: DEVICE (page 1 of 19)

Offset Length Type Formatted Variable Name Description

1 4 X FC10.#_UCB_ADDR UCB address

Note: To determine if the MVS device number (at offset 45,2) is valid, you can test this field. If the field is 0, then there is no corresponding MVS device.

5 1 X FC10.#_DFB1 Device flag byte 180-DEVICE ENTRY IS VALID 10-UCB IS VALID 04-VALIDATE COMMAND ISSUED 02-REFRESH COMMAND ISSUED 01-RFR-RSUM COMMAND ISSUED

6 6 C FC10.#_VOLSER Volume serial

12 1 X FC10.#_CHNL_DEVADDR Device address on channel

13 4 X FC10.#_#INVALID_M1 Number of M1 invalids




29 4 X FC10.#_NBR_ITRKSR1 Number of R1 invalid tracks

33 4 X FC10.#_NBR_ITRKSR2 Number of R2 invalid tracks

37 4 X FC10.#_WPENDING_CNT Write pending count

41 4 X FC10.#_MAXADAPT_COPYWP_TRKS

Max adcopy skew

45 2 X FC10.#_MVS_DEV# MVS device number

47 2 X FC10.#_NBR_CYLS Number of cylinders

49 2 X FC10.#_SYM_DEV# Symmetrix device number

51 2 X FC10.#_DA#IF_M1 Interface address of M1



REXX Variables



57 2 X FC10.#_DA#IF_M4 Interface address of M4 Format of the interface fields are as follows: DDXI - Where DD is the director number, X is C,D,E, or F, and I is X'0'-X'F'. If XI = X'00' then use the interface fields at offset 288.

59 2 X FC10.#_RAID_GRP RAID group

61 1 X FC10.#_RDF_GRP RDF group x'FF' indicates no group assigned

62 1 X FC10.#_R1_MIRROR# R1 mirror # (or 0)

63 1 X FC10.#_R21_MIRROR# R2(1) mirror # (or 0)

64 1 X FC10.#_R22_MIRROR# R2(2) mirror # (or 0)

65 2 C FC10.#_MR Mirror type PV - Power Vault DR - Disaster Recovery RS - Raid L1 - Local R1 L2 - Local R2 BC - BCV R1 - R1 R2 - R2 A1 - SRDFA R1 A2 - SRDFA R2 FS - File System CD - COVD VD - Virtual SV - Log Save ML - Mirror Local

67 1 X FC10.#_RAID_MIRROR# RAID data mirror #

68 1 X FC10.#_PARITY_MIRROR# Parity mirror #



64

REXX Variables


Note: For Mirror Disk Flag 1, flag bytes 20 and 10 set will be set for Cascaded SRDF devices.

69 1 X FC10.#_DF1_M1 Mirror 1 - Disk Flag 120-RDF PRIMARY DEVICE (R1) 10-RDF SECONDARY DEVICE (R2) 08-HOT SPARE 04-RAID DEVICE 02-RAID PARITY DEVICE

70 1 X FC10.#_DF1_M2 Mirror 2 - Disk Flag 120-RDF PRIMARY DEVICE (R1)10-RDF SECONDARY DEVICE (R2)08-HOT SPARE 04-RAID DEVICE 02-RAID PARITY DEVICE



Note: For Mirror Disk Flag 2, if bits 01 and 02 are not set, then the device is a CKD.

73 1 X FC10.#_DF2_M1 Mirror 1 - Disk Flag 202-BCV DEVICE 01-FBA DEVICE

74 1 X FC10.#_DF2_M2 Mirror 2 - Disk Flag 2 02-BCV DEVICE 01-FBA DEVICE



REXX Variables


75 1 X FC10.#_DF2_M3 Mirror 3 - Disk Flag 202-BCV DEVICE 01-FBA DEVICE

76 1 X FC10.#_DF2_M4 Mirror 4 - Disk Flag 2 Not 01 or 02 - CKD02-BCV DEVICE 01-FBA DEVICE

77 1 X FC10.#_DF3_M1 Mirror 1 - Disk Flag 380-R2 NR IF INVTRKS 20-WORM DEVICE 10-SHARED CKD/FBA DEVICE 08-OPTIMIZER DRV DEVICE 04-META DEVICE




81 1 X FC10.#_DF6 Disk Flag 6 80-M1 CONFIGURED AT IML 40-M2 CONFIGURED AT IML 20-M3 CONFIGURED AT IML 10-M4 CONFIGURED AT IML



66

REXX Variables


82 1 X FC10.#_DF7 Disk Flag 7 - Device Configuration Settings40-SYMMETRIX FILE SYSTEM DEVICE 10-DYNAMIC R2 DEVICE 08-DYNAMIC R1 DEVICE

83 1 X FC10.#_DSF1 Device status Flag 1 80-READY 40-RDF NOT READY 10-DOMINO MODE 08-M1 CURRENTLY CONFIGURED 04-M2 CURRENTLY CONFIGURED 02-M3 CURRENTLY CONFIGURED 01-M4 CURRENTLY CONFIGURED

84 1 X FC10.#_DSF2 Device status Flag 2 80-M1 NOT READY 40-M1 WR DISABLED 20-M2 NOT READY 10-M2 WR DISABLED 08-M3 NOT READY 04-M3 WR DISABLED 02-M4 NOT READY 01-M4 WR DISABLED

85 1 X FC10.#_DSF3 Device status flag 3 20-RAID DEVICE 02-1 JOURNAL1 MODE 0 JOURNAL0 MODE 01-RDF ITRK MODE

86 1 X FC10.#_DSF4 Device status Flag 4 80-BCV NR 40-DEV IN CONGROUP 20-SPIN UP W/DD 08-FILE SNAP DEV (SRC) 04-FILE SNAP DEV (TGT) 02-MIRROR NOT READY (USER) 01-CGROUP NOT READY (TRIPPED)



REXX Variables


87 1 X FC10.#_DFB2 Device Flag 2 08-SOURCE NOT READY 04-TARGET NOT READY 02-SRC WR-DISABLED 01-TGT WR-DISABLED

88 1 X FC10.#_REMM1_MS Mirror1 Remote mirror state80-NOT READY 40-WRITE DISABLED 20-ADAPTIVE COPY DISK MODE 10-ADCOPY WRITE PENDING MODE08-RMT MIRROR POSITION VALID

89 1 X FC10.#_REMM1_RDFDEV_GRP M1 Remote Symmetrix RDF device group

90 2 X FC10.#_REMM1_DEV# M1 Remote Symmetrix device number

92 4 X FC10.#_REMM1_INVTRK M1 Remote device invalid track count

96 4 X FC10.#_REMM1_WPEND_CNT M1 adcopy write pending count

100 4 X M1 4 bytes unused









68

REXX Variables














152 1 X Reserved

153 1 X FC10.#_RDFSTATE RDF state R2 state flags 20-R2 IN R/W MODE10-R2 NOT READY

154 1 X FC10.#_FLAGR Flagr80-RAID10 HEAD DEV 40-RAID10 MEMBER DEV 20-META HEAD DEV 10-META MEMBER DEV



REXX Variables


155 1 X FC10.#_DSMFLG Miscellaneous device flags80-M1 IS SYNCH'D 40-M2 IS SYNCH'D 20-M3 IS SYNCH'D 10-M4 IS SYNCH'D 08-FILE SNAP DEV (SRC) 04-FILE SNAP DEV (TGT) 02-MIRR NOT READY (USER) 01-CGRP NOT READY (TRIPPED)

156 1 X FC10.#_DSF5 Device Status Flag 5 80-WRITE & VERIFY MODE 40-BCV DEVICE 20-PREFETCH TAIL CUT DISABLE 10-PREFETCH MODE ENABLED08-DISABLE SCSI TAG COMMAND 04-DISABLE AUTO BUFR RATIO ALGOR 02-WRITE VERIFY COMPARE MODE 01-DEVICE IN RAID GRP

157 1 X FC10.#_DSF6 Device Status Flag 6 80-HA NON-EXCLUSIVE ACCESS 40-FILE SYSTEM DEVICE 20-ORACLE CHECKSUM DEV 10-DYNAMIC R2 DEVICE 08-DYNAMIC R1 DEVICE 04-DATA STRIPING DEV 02-520 BYTES/BLOCK LOW-LVL FMT 01-REAL TIME BEHAVIOR

158 1 X FC10.#_DFB3 FC10.#_PPRC (Y/N)

Device flag 3 20-OPERATING IN PPRC MODE

159 1 XFC10.#_XRC (Y/N) FC10.#_COVD (Y/N)FC10.#_BESTR (Y/N)FC10.#_DMYDV (Y/N)

Device status flag 7 10-XRC CAPABLE DEVICE 04-COVD DEVICE 02-BACK-END STRIPED DEV 01-DUMMY DEVICE ENTRY



70

REXX Variables


160 1 X FC10.#_MHDFC10.#_METAHDFC10.#_META FC10.#_ECADFC10.#_LOGFC10.#_VIRFC10.#_CKDM

Config mist flag2 20-META HEAD DEVICE 10-META DEVICE 08-ECA DEFINED 04-LOG DEVICE 02-VIRTUAL DEVICE 01-STRIPED CKD DEVICE

161 1 C FC10.#_SRDFA SRDFA device (Y/N)

162 1 C FC10.#_SRDFA_ACT SRDFA device active (Y/N)

163 2 X Reserved

165 4 X FC10.#_SRDFA_SLOTS_ACT SRDFA device # of slots active

169 4 X FC10.#_SRDFA_SLOTS_INACT SRDFA device # of slots notactive

173 1 C FC10.#_RAID5DEV RAID5 device ? (Y/N)

174 1 C FC10.#_R5READYS RAID5 device ready state N-NOT READY 1-DEGRADED MODE: 1 DEV READY, 1 MBR NOT READY, SPARE NOT READY 2-DEGRADED MODE: 2 DEV READY, 1 MBR NOT READY, SPARE READY R-DEVICE READY: DEV READY, MBRS READY, SPARE NOT READYS-DEV & SPARE READY: DEV READY, MBRS READY, SPARE READY

175 1 C FC10.#_R5RWS RAID5 device ReadWrite state D-DEV WRT DISABLED SPARE WRT DISABLED 1-DEV WR ENABLED ONE MBR WR DISABLED 2-DEV WR ENABLED 1 MBR WR DISABLED SPARE WR ENABLED E-DEVICE AND MEMBERS WR ENABLED SPARE WR DISABLED S-DEVICE, MEMBERS

176 1 C FC10.#_R5SPVALD RAID5 device spare info valid

177 1 C FC10.#_R5SPINVK RAID5 device spare invoked



REXX Variables


178 1 X FC10.#_R5SPMEMB RAID5 device MBR# spare invoked

179 1 X FC10.#_R5SPMIRD RAID5 device MIR# spare invoked

180 1 X FC10.#_R5SPMIRS RAID5 device MIR# of spare

181 1 X FC10.#_R5SPDIR RAID5 device director for spare

182 1 C FC10.#_R5SPCDIR RAID5 device copy direction 0 - Copy to spare1 - Copy from spare

183 1 X FC10.#_R5FLMEM RAID5 device MEM# failing device FF - if no failing device

184 1 X FC10.#_R5DATMR RAID5 MIR# for RAID5 device

185 1 X FC10.#_R5OTHMR RAID5 MIR# held for RAID5 device

186 1 X DA for invoked spare

187 1 X IF for invoked spare

188 1 X Invoked spare IF address

189 2 X RAID5 stripe width

191 2 X Reserved

193111112113

CCCCXXXXX

FC10.#_DVR5MBR.1_MEMRDY FC10.#_DVR5MBR.1_SPARRDYFC10.#_DVR5MBR.1_MEMRW FC10.#_DVR5MBR.1_SPARRW FC10.#_DVR5MBR.1_DIR FC10.#_DVR5MBR.1_TARGET FC10.#_DVR5MBR.1_IF FC10.#_DVR5MBR.1_ADR

RAID5 Member 1Member ready (Y/N) Spare ready (Y/N)Member R/W (Y/N)Spare R/W (Y/N)Director number Target number Interface addressDevice addressReserved



72

REXX Variables


205111112113

CCCCXXXXX


RAID5 Member 2Member ready (Y/N)Spare ready (Y/N)Member R/W (Y/N)Spare R/W (Y/N)Director number Target number Interface addressDevice addressReserved

217111112113

CCCCXXXXX



229111112113

CCCCXXXXX





REXX Variables


241111112113

CCCCXXXXX


RAID5 Member 5Member ready Spare ready Member R/W Spare R/W Director number Target number Interface addressDevice addressReserved

253111112113

CCCCXXXXX



265111112113

CCCCXXXXX





74

REXX Variables


277111112113

CCCCXXXXX



289 2 X FC10.#_IF2_M1 M1 interface address



295 2 X FC10.#_IF2_M4 M4 interface addressFormat of the interface fields is as follows: X0IF - Where X is C,D,E,F,G or H and IF is X'00'-X'11'

297 1 C RAID6 device Y/N

298 1 C RAID6 ready N/1/2/R

299 1 C RAID6 device R/W D/1/2/E

300 1 X RAID6 device data mirror #

301 2 X RAID6 stripe width

303 2 X Reserved

305

1112115

CCXXXXX

RAID6 member #1 info. Each RAID6 member will have the following format.RAID6 Member Ready Y/NRAID6 Member R/W Y/NRAID6 Member Director#RAID6 Member Target #RAID6 Member InterfaceRAID6 Member IF Addr Reserved

317 12 RAID6 Member #2 Info



REXX Variables
















497 2 X RAID10 Member #1 Dev #




505 1 C FBA user not ready (Y/N)

506 1 X FBA stripe size

507 2 X FBA # of members

509 1 C FBA META prev device valid (Y/N)

510 1 C FBA META next device valid (Y/N)

511 2 X FBA META prev member device #

513 2 X FBA META next member device #



76

REXX Variables


515 1 X Device emulation code40 - Device is an FBA20- Device is a 33801F - Emulation size code table

516 1 X RDF Mirror 1 Flag1

517 1 X RDF Mirror 1 Flag204 - ConGroup is enabled







Note: You must specificly request the RDF Mirror Flag fields listed above. See “EMCSRDF_DEVFLAG” on page 15 for more information.

523 Object length

Additional primed variables

FC10.#_ACT Command is active V-Validate R-Refresh

FC10.#_INDEX Remote mirror position

FC10.#_R1_INVTRKS Number of invalids owed to the R1

FC10.#_R2_INVTRKS Number of invalids owed to the R2



REXX Variables


FC10.#_REM_TYPE Remote type S-SourceT-Target

FC10.#_SY Synchronization percentage

FC10.#_ITA Invalid track attribute, I-If set

FC10.#_NR Device not ready, N-If set

FC10.#_RNR RDF not ready, R-If set

FC10.#_DOM Domino mode, D-If set

FC10.#_M1_NR Mirror1 not ready, X-If Set

FC10.#_M1_WD Mirror1 write disabled, X-If Set







FC10.#_SNC Sync/Semisync SYSS

FC10.#_TGT Target T-Target not readyR-Write disabled

FC10.#_WRT Source write disabled, W-If set

FC10.#_ADC Adaptive copy D-DiskW-Write

FC10.#_REMSYMM_RDGRP Remote Symmetrix RDF group

FC10.#_REMSYMM_DEV# Remote Symmetrix device number



78

REXX Variables


FC10.#_REMM1_ADC Remote Mirror1 adaptive copy D-DiskW-Write

FC10.#_MIRROR1 Mirror1 formatted data DA-IF ITRKS NR/WD







FC10.#_R2RW R2 in R/W mode (Y/N)

FC10.#_R2NR R2 not ready (Y/N)

FC10.#_RAID10HD RAID10 head dev (Y/N)

FC10.#_RAID10MB RAID10 member dev (Y/N)

FC10.#_METAMB Meta member dev

FC10.#_M1SYNC Mirror1 synched (Y/N)




FC10.#_FSNAPSRC File snap source (Y/N)

FC10.#_FSNAPTGT File snap target (Y/N)

FC10.#_NRDYUSER Not ready user action (Y/N)



REXX Variables


FC10.#_CGRPTRPD ConGroup tripped (Y/N)

FC10.#_BCVDEV BCV device (Y/N)

FC10.#_DYNR1 Dynamic R1 capable (Y/N)

FC10.#_DYNR2 Dynamic R2 capable (Y/N)

FC10.#_FILESYS File system device (Y/N)

BCV information record

Offset Length Type Description

1 2 X Symmetrix BCV number

3 2 X Symmetrix STD number

5 2 C Symmetrix device number of last paired

7 1 C Multiple local mirrors (Y/N)

8 1 C BCV RDF type, 1=R1 2=R2

9 1 C BCV RAID10 (Y/N)

10 1 C BCV RAID5 (Y/N)

11 1 C Pair Attached(Y) Split(N)

12 1 C Established/Restored (E/R)This field is blank if offset 11 is N.

13 1 C Synchronized (Y/N)This field is blank if offset 11 is N.

14 1 C BCV is/was attached (Y/N)

15 1 C SDDF session exists (Y/N)

16 1 C Reverse split allowed (Y/N) This field is blank if offset 11 is N.

17 1 C Normal split running (Y/N)

18 1 C Instant split running (Y/N)

19 1 C CTR#3 second pass (Y/N) This field is blank if offset 18 is N.



80

REXX Variables

BCV information record

Offset Length Type Description

20 1 C BCV syncing (Y/N) This field is blank if offset 11 is N.

21 1 C Split before sync BCV (Y/N) This field is blank if offset 11 is Y.

22 1 C Sync to/from moving mirror (T/F) This filed is blank if offset 11 is Y, if offset 20 is N, or if offset 7 is N.

23 1 C Protected restore (Y/N)

24 1 C SMMF held file (Y/N)

25 1 C Invalid BCV (Y/N)

26 1 C Both BCV mirrors attach (Y/N)

27 1 C STD ready for establish (Y/N) This filed is blank if offset 11 is Y.

28 1 C STD knows another BCV (Y/N)

29 1 C Background split>1 mirror (Y/N) This field is blank if offset 11 is N.

30 1 C STD held for SNAP (Y/N)

31 4 X CTR#1 number of tracks left to sync

35 4 X CTR#2 number of tracks to sync next

39 4 X Tag

43 4 X Split time in 1/2 seconds

47 2 X CTR#3 number of tracks left to split

49 2 X TimeFinder/Clone session ID

51 6 C Reserved

56 Object length



REXX Variables

Table 15 Function 11, Object name: LINK (page 1 of 2)


1 4 X FC11.#_TOTIOS Total # IOs

5 1 X FC11.#_DIR# Director #

6 1 C FC11.#_DIR_TYPE Director type 1-RA1 2-RA2 F-FIBER RA

7 1 X FC11.#_OS_DIR# Other side director number

8 12 C FC11.#_OS_SYMM# Other side Symmetrix serial number

Note: This field may contain all periods. If so, this value indicates a switched director and this field will not be accurate. Use the RDF group object to obtain a more complete picture of the RDF relationships between the Symmetrix systems. For statistics, use the dstat object.

20 1 X FC11.#_RDF_GRP RDF groupIf '*' then use “This side group mask * 15……..1” on page 82

21 1 X FC11.#_OS_RDFGRP Other side RDF groupIF '*' then use “Other side group mask ** 15……..1” on page 82

22 1 C FC11.#_DIR_OLFLAG Dir Online Flag (Y/N)

23 1 C FC11.#_DIR_CONFLAG Dir Connected Flag (Y/N)

24 1 X FC11.#_SI_PCTBUSY Short Interval % busy

25 2 X FC11.#_SI_IORATE Short Interval I/O Rate

27 1 X FC11.#_SI_TIMEMM Short Interval time - MM

28 1 X FC11.#_SI_TIMESS Short Interval time - SS

29 1 X FC11.#_LI_PCTBUSY Long Interval %busy

30 2 X FC11.#_LI_IORATE Long Interval I/O Rate

32 1 X FC11.#_LI_TIMEDD Long Interval time - DD


82

REXX Variables


33 1 X FC11.#_LI_TIMEHH Long interval time - HH

34 1 X FC11.#_LI_TIMEMM Long interval time - MM

35 1 X FC11.#_LI_TIMESS Long interval time - SS

36 8 X FC11.#_OS_DIR#L Other side RA mask 64........1 Bitmap identifying the directors on the remote side that can communicate with this local director. The bits are numbered from right to left, with the low-order bit (0000000000000001) representing director 1 on the remote side. The high-order bit (1000000000000000) represents director 64 on the remote side. In a switched environment, multiple bits can be set indicating that multiple directors on the remote side can communicate with this one.

44 2 X This side group mask * 15……..1 Bitmap identifying the groups on this side in which the director is included. The bits are numbered from right to left, with the low-order bit (x'0001') representing group 0. The high-order bit (x'8000') represents group 15.

46 2 X Other side group mask ** 15……..1 Bitmap identifying the groups on this side in which the director is included. The bits are numbered from right to left, with the low-order bit (x'0001') representing group 0. The high-order bit (x'8000') represents group 15.

Note: For the above items, numbering starts at 1 for directors and starts at 0 for groups. It is important to note also that in level 5x69 Enginuity™ and above, 64 groups are supported. This increase in groups means that the group masks in the LINK object are not large enough to map the groups. This is a restriction of the syscalls that are used to acquire the link information. At these Enginuity levels, use the GROUP objects and not the LINK objects.

48 1 X Reserved

48 Object Length

Table 15 Function 11, Object name: LINK (page 2 of 2)


REXX Variables

Table 16 Function 12, Object name: DIRECTOR


1 1 X FC12.#_DIR# Director #

2 1 C FC12.#_DIR_TYPE Director type C-CA DIRECTOR E-EA DIRECTOR D-DA DIRECTOR S-SA DIRECTOR W-FIBRE DISK 1-RA1 2-RA2 F-FIBER RA A-FIBRE SA I-FICON DIRECTOR G-GIGE (RA MODE) X-2 PORT FIBRE RA Y-2 PORT FIBRE SA

3 1 C FC12.#_DIROL Director Online flag (Y/N)

4 1 C FC12.#_DIRCON Director Connected flag (Y/N)

5 4 X Reserved

8 Object Length


84

REXX Variables

Table 17 Function 14, Object name: RDFGROUP (5x67 and higher microcode level) (page 1 of 8)

New for SRDF Host Component version 5.3 and later. This object contains the STAR/SRDFA/MSC object information. There are only a small number of formatted variables available. To access this object you should use the raw object data only. The information in this object replaces the data in SRDFA Object 16.


1 1 X FC14.#_RDFGRP RDF group

2 1 X FC14.#_OSRDFGRP Other side RDF group

3 12 C FC14.#_OSSER# Other side serial number

15 2 X FC14.#_OS_MAJREL Other side major release

17 2 X FC14.#_OS_MINREL Other side minor release

19 2 X FC14.#_OS_MODEL Other side model

21 4 X FC14.#_OS_FEAT Other side features

25 1 C FC14.#_SYND Sync direction0-NONE 1-R1>R2 2-R1<R2 3-CNFG?-Unable to determine sync direction

26 1 C FC14.#_ONLINE Online or offline (Y/N)

27 1 C FC14.#_FIBER Fiber protocol (Y/N)

28 1 C FC14.#_ESCON Escon protocol (Y/N)

29 1 C FC14.#_IP IP protocol (Y/N)

30 1 C FC14.#_SRDFA SRDFA group (Y/N)

31 1 C FC14.#_DYNAMIC Dynamic group (Y/N)

32 8 X Reserved

40 8 X FC14.#_DIRECTORS Director list. For this RA group, contains an 8-byte list of director numbers. Note that since directors are numbered starting with one, a zero terminates the list. If the 1st byte is zero, then the list is empty.


REXX Variables


48 8 X Reserved

56 10 C FC14.#_LABEL Label

66 7 X Reserved

73 136 Reserved

209 136 Reserved

345 12 C This side serial number

357 4 X Enginuity microcode level (major/minor)

361 48 MSC/Star scratch area 192_06 See “MSC Object” on page 90.

409 6 X Reserved

MSC/STAR boxlist area

415 2 X Number of boxlist entries

417 768 24 boxlist entriesSee "“MSC Box List Object” on page 91.

Note: These boxlist area variables have been relocated to the BOXLIST.# variables.

1185 66 C BCV GNS group name

1251 1 X Auto Restart policy-1

1252 1 X Auto Restart policy-2

1253 4 X Auto Restart invalid track count

1257 1 X Auto Restart minimum number of RDF directors



86

REXX Variables


1258 1 X Auto Restart Flag 280-DROP ALL SRDF/A SESSIONS ON FAILURE40-REMOVE FAILING SESSION ON FAILURE20-DISABLE MSC ENVIRONMENT ON FAILURE10-IF MSC VALIDATION FINDS PROBLEMS ONLY WARN ON THE ERROR08' DO NOT PERFORM VALIDATION04' STAR WITH AUTOSWAP REQUESTED02' ONE OR MORE SESSIONS ARE DEFINED VIA GNS01' REMOTE CYCLE SWITCHING

1259 1 x Auto Restart session RA groupThis is the synchronous group in a cascaded R21 configuration.

1260 5 Reserved

1264 Object length

SRDF/Star Local/Remote Object


1 1 C SRDFA type (1=R1, 2=R2)

2 1 C SRDFA active (Y/N)

3 1 C SRDFA tolerance (Y/N)

4 1 C Cleanup running (Y/N)

5 1 C Host managed const (Y/N)

6 1 C SRDF/Star mode (Y/N)

7 1 C Consistent deact if cycle switch is immediate S - SUCCEED F - FAIL

8 1 C Freeze state



REXX Variables


9 1 X State at transition to J0 0 - NOSTATE 1 - START 2 - GOOD 3 - ALMOST DONE

10 1 X Status last transition to J0 0 - NOT IN PROGRESS1 - IN PROGRESS 2 - SUCCESSFUL 3 - FAILED

11 1 X Priority for drop policy

12 1 X The percentage of the system write pending limit at which SRDF/A will drop

13 4 X Active cycle size R1 SIDE: CAPTURER2 SIDE: APPLY

17 4 X Inactive cycle size R1 SIDE: TRANSMITR2 SIDE: RECEIVE

21 2 X # seconds since last cycle

23 2 X # seconds duration of last cycle

25 2 X Current cycle # active on R1 inactive on R2

27 2 X Maximum throttle time

29 2 X Minimum cycle length

31 2 X Secondary delay

33 4 X Last cycle size

37 4 X # consistency exmpt

41 4 X Average cycle time (secs)

45 4 X Average cycle size (slots)

49 8 X Tag for MS turn on

57 8 X Tag for MS turn off



88

REXX Variables


The following information is only valid on the R1 side. Check SRDFA type at offset 1.

65 1 C MS window open? (Y/N)

66 1 C Remote consistent? (Y/N)

67 1 C Pure ready state? (Y/N)

68 1 X R1 Flag 104 Transmit Idle08 DSE Active

69 4 X # Tracks written by

73 4 X # Repeat writes by HA

77 4 X # Duplicated slots by HA

**************************** End of R1 Specific fields ****************************

The following information is only valid on the R2 side. Check SRDFA type at offset 1.

81 1 C Restore done? (Y/N)

82 1 C R2 suspended? (Y/N)

83 1 X R2 Flag 104 Transmit Idle08 DSE Active

84 1 C Reserved

85 4 X # Slots restored by DA

89 4 X # Slots merged by DA

93 4 X # Seconds for last restore

97 4 X Average restore time

101 4 X SUSP/RSUM token created when cycle switch was suspended

**************************** End of R2 Specific fields ****************************

105 1 C SRDFA active? (Y/N)

106 1 C R1 inactive cycle empty (Y/N)



REXX Variables


107 1 C R2 active cycle empty (Y/N)

108 1 C Inactive cycle on R2 requires intervention R2 side only (Y/N)

109 1 C Force option must be (Y/N)

110 1 C 1ST CONSISTENT CYCLE (Y/N)

111 1 C 2ND CONSISTENT CYCLE (Y/N)To check for GLOBAL CONSISTENCY, do the following from the R1 side: Check the REMOTE CONSISTENT field at offset 66 and if it is Y then check 1ST CONSISTENT CYCLE and 2ND CONSISTENT CYCLE. If they are both Y, then GLOBAL CONSISTENCY exists.

112 1 C Star mode ahead (Y/N)

113 1 X # cycles JA ahead of J0

114 1 C MSC is active (Y/N)

115 2 X Cycle number

117 1 C Globally consistent (Y/N)

118 3 X Reserved

121 1

21

4

X

XX

X

Active cycle tag 80-FIRST CONSISTENT CYCLE 40-SECOND CONSISTENT CYCLE 20-STAR MODE 10-SITE B IS NOT CONSISTENT ReservedCounter of the number of cycles site C is ahead of site BActive cycle

129 8 X Inactive cycle tag

137 4 X Number of seconds since the last cycle switch

141 4 X Duration in seconds of the last cycle

144 Object Length



90

REXX Variables

MSC Object


1 1 C Version0-MSC 1-MSC/STAR

2 1 C List complete (Y/N)

3 1 C MVS defined (Y/N)

4 1 C OS defined (Y/N)

5 1 C Star mode (Y/N)

6 1 C Dynamic target cycle #

7 1 C Disable (Y/N)

8 1 C J0 group (Y/N)

9 1 C Primary side (Y/N)

10 1 X Reserved

11 2 X Target cycle time in seconds

13 1 X My other side group

14 1 X Corresponding R1 group

15 1 X Corresponding R2 group

16 1 X New RDF recovery group

17 8 C Group name

25 4 X SDDF session 1 token

29 4 X SDDF session 2 token

33 16 X Reserved

48 Object Length



REXX Variables

MSC Box List Object


1 12 C Primary side serial number

13 1 X Primary side group

14 12 C Secondary side serial number

26 1 X Secondary side group

27 6 X Reserved

32 Object Length



92

REXX Variables

Table 18 Function 15, Object name: RGRPSTAT (5x67 and higher microcode level)


1 1 X FC15.#_RDFGROUP RDF group

2 1 X FC15.#_TSDIR# This side director #

3 1 X FC15.#_CONFLAGS Config flags 80-MULTIPATH 40-PATH REASSIGNED FROM GROUP 20-GROUP DISBANDED 10-SINGLE PATH

4 1 X FC15.#_PROTOCOL Protocol

5 1 X FC15.#_FCTOP1 FC topology 1

6 1 X FC15.#_FCTOP2 FC topology 2 flag01-FC PRIVATE ARBRITRATED LOOP 02-FC PUBLIC ARBRITRATED LOOP 04-FC POINT TO POINT 08-FC SWITCHED 10-IP

7 8 X FC15.#_WWNAME World Wide Name

15 4 X FC15.#_OSFEA Other side features

19 2 X FC15.#_OSMAJCL Other side major code level

21 2 X FC15.#_OSMINCL Other side minor code level

23 1 X FC15.#_OSMOD# Other side model number

24 1 X FC15.#_OSDIR# Other side director number

25 1 X FC15.#_OSPOST Other side post state

26 1 X Reserved

27 8 X FC15.#_DICNT Data in counter

35 8 X FC15.#_DOCNT Data out counter

43 6 X Reserved

48 Object length


REXX Variables

Table 19 Function 17, Object name: DSTAT (page 1 of 5)


1 1 X FC17.#_FORMAT Director statistics format 02-ESCON 03-SCSI SA DIRECTOR 04-DISK DIRECTOR 06-FIBRE SA DIRECTOR 07-ESCON HW (RA2 MODE) 0B-FICON DIRECTOR TYPE

2 1 X FC17.#_DIRTYPE Director type 01-CA - PARALLEL CHNL ADAPTER 02-EA - ESCON 03-SA - SCSI SA DIRECTOR 04-DA - DISK DIRECTOR 05-RA1 - ESCON HW (RA1 MODE) 06-FA - FIBRE SA DIRECTOR 07-RA2 - ESCON HW (RA2 MODE) 08-GE - GIGE (RA MODE) 09-RF - FIBER (RA MODE) 0A-DF - FIBRE DISK 0B-FI - FICON DIRECTOR TYPE 0C-R2 - 4 PORT FIBRE (RA) 0D-F2 - 4 PORT FIBRE SA 0E-SE - GIGE SA (ISCSI)

3 1 X FC17.#_DIRNUM Director #

4 13 X Reserved

17 256 X Director statistics info (See records below)

272 Object length


94

REXX Variables

Format 2 Director type EA


1 4 X FC17.#_FMT2_NUM_WRT Number of writes

5 4 X FC17.#_FMT2_TTL_IO Number of total I/Os

9 4 X FC17.#_FMT2_HIT Number of hits

13 4 X FC17.#_FMT2_TTL_REQ Number of requests

17 4 X FC17.#_FMT2_READ_MISS Number of read misses

21 4 X FC17.#_FMT2_SYS_WP System write pendings

25 4 X FC17.#_FMT2_DEV_WP Device write pendings

28 Object length

Format 3 Director type SA




9 4 X FC17.#_FMT3_IO_PORT0 Number of I/O for port 0


17 4 X FC17.#_FMT3_THRU_PORT0 Number of TPUT on port 0







44 Object length



REXX Variables

Format 4 Director type FA











Format 4 Director type FA




44 Object length

Format 6 Director type DA



5 4 X FC17.#_FMT6_REQ Number of requests

9 4 X FC17.#_FMT6_READ Number of reads

13 4 X FC17.#_FMT6_WRITE Number of writes

17 4 X FC17.#_FMT6_PREF_TRKS Number of prefetched tracks

21 4 X FC17.#_FMT6_PREF_TRKS_NUSED Number of prefetched tracks not used

25 4 X FC17.#_FMT6_PREF_TRKS_USED Number of prefetched tracks used



96

REXX Variables

Format 6 Director type DA


29 4 X FC17.#_FMT6_SHORT_MISS Number of short misses

33 4 X FC17.#_FMT6_LONG_MISS Number of long misses

37 4 X FC17.#_FMT6_RESTARTS Prefetch restarts

41 4 X FC17.#_FMT6_PREF_TSKS_MISMATCH Number of prefetch mismatches

45 4 X FC17.#_FMT6_TTL_SSD_REQ_CNTR Number of permacache requests

49 4 X FC17.#_FMT6_LRU_AVG_FALL_THRU_TIME Average fall thru time

52 Object length

Format 7 Director type RF


1 4 X FC17.#_FMT7_TTL_IO Number of I/Os

5 4 X FC17.#_FMT7_LINK_UTIL_CNTR RDF Link util ctr

9 4 X FC17.#_FMT7_T1_LINK_UTIL_CNTR Time T1 link util ctr

13 4 X FC17.#_FMT7_T2_LINK_UTIL_CNTR Time T2 link util ctr

17 4 X Reserved

21 4 X Reserved

25 8 X FC17.#_FMT7_KB_RECEIVED RDF kilobytes received

33 8 X FC17.#_FMT7_KB_SENT RDF kilobytes sent

41 4 X FC17.#_FMT7_RECEIVED RDF received

45 2 X FC17.#_FMT7_RECEIVEU Received units

47 2 X Reserved

49 4 X FC17.#_FMT7_SENT RDF sent

53 2 X FC17.#_FMT7_SENTU Sent units

55 2 X Reserved

56 Object length



REXX Variables

Format 11 Director type SE








Format 11 Director type SE







44 Object length



98

REXX Variables

Table 20 Function 20, Object name: DEVICE ID (page 1 of 2)


1 12 C Symmetrix serial number

13 2 X Controller type

15 1 X Controller model

16 2 C Symmetrix type

18 2 X Microcode level

20 3 C Manufacturer

23 2 X Subsystem ID

25 1 C Partition ID

26 1 X LSS

27 6 C Reserved

33 2 X Symmetrix device number

35 2 X Device type

37 1 X Device model

38 4 X Device size

42 2 X Physical block (FBA only)

44 1 X Device class

45 1 X Device code

46 1 X UADDR

47 1 X LADDR

48 1 X PADDR

49 1 C Symmetrix device number is valid

50 1 C Not at minimum MCLV

51 1 C FBA device

52 1 C Virtual device


REXX Variables


53 1 C CKD device

54 1 C Meta head

55 1 C Meta device

56 9 C Reserved

65 1 C PAV alias device

66 1 C PAV base device

67 2 X Base Symdev number

68 Object length

Table 20 Function 20, Object name: DEVICE ID (page 2 of 2)


100

REXX Variables


Glossary

This glossary contains terms related to the REXX interface. Many of these terms are used in this guide.

Aadaptive copy - disk

mode (AD)An SRDF mode of operation that stores new data for a remotely mirrored pair on the source volume of that pair as invalid tracks until it can be successfully transferred to the target volume. A “skew” parameter associated with this mode indicates the maximum number of tracks that can be out of synchronization between the two volumes at any given time. This skew parameter value is set at the device level in Symmetrix units at microcode level 5061 and later and can range from 1 to 65,535 (decimal). In Symmetrix units at microcode level 5060, this skew parameter value is set at the controller level and is the same for all remotely mirrored pairs configured for the Adaptive Copy mode. This skew value can range from 1 to 999,999 (decimal).

adaptive copy - writepending mode (AW)

An SRDF mode of operation that stores new data for a remotely mirrored pair in the cache of the local Symmetrix unit until it can be successfully written to both the source and target volumes. A “skew” parameter associated with this mode determines the maximum number of write pendings that can exist for a remotely mirrored pair. (There is a skew value for each remotely mirrored pair configured for the Adaptive Copy mode in Symmetrix units at microcode level 5061 and later.) This skew parameter is set at the device level and can range from 1 to 65,535 (decimal).


102

Glossary

Bbusiness continuance

volume (BCV)A new mirror that can be established and then split from its mirror and addressed separately.

Ccache Random access electronic storage used to retain frequently used data

from disk for faster access by the channel.

channel director The component in the Symmetrix subsystem that interfaces between the host channels and data storage. It transfers data between the channel and cache.

Ddestage The asynchronous write of new or updated data from cache to disk

device.

device A uniquely addressable part of the Symmetrix subsystem that consists of a set of access arms, the associated disk surfaces, and the electronic circuitry required to locate, read, and write data.

device address The hexadecimal value that uniquely defines a physical I/O device on a channel path in an MVS environment.

device number The value that logically identifies a disk device in a string.

diagnostics System level tests or firmware designed to inspect, detect, and correct failing components. These tests are comprehensive and self-invoking.

disk director The component in the Symmetrix subsystem that interfaces between cache and the disk devices.

domino attribute An optional feature for source volumes. When enabled, this feature causes a source volume to become not ready to its host and all I/O activity ceases with that volume if the target volume fails or a link failure occurs. When the fault condition is corrected, the user must manually make the source volume ready. This feature ensures that a remotely mirrored pair is always synchronized.


Glossary

dynamic sparing A Symmetrix feature that automatically transfers data from a failing disk device to an available spare disk device without affecting data availability. This feature supports all devices in the Symmetrix subsystem.

Ffast write In Symmetrix, a write operation at cache speed that does not require

immediate transfer of data to disk. The data is written directly to cache and is available for later destaging.

Ggigabyte (GB) 109 bytes.

Iidentifier (ID) A sequence of bits or characters that identifies a program, device,

controller, or system.

IML Initial microcode program loading.

invalid track An invalid track occurs when data is written to a disk track, and that data is not yet reflected on the partner device. The track on the partner device is said to be invalid. In the normal case where the source (R1) and target (R2) volumes are in communication and staying in synch, the updated track is passed to the target device and once it is written there, it is no longer invalid. If the source and target devices are not in communication for some reason (for instance, if the SRDF links are disabled), the invalid tracks build up over time. The R1 invalid track count can also be built up if the source (R1) volume is not ready to the host while the link is operational and data is being written to the source (R1) volume. Invalid tracks for the source (R1) volume may also be generated during R2 Read/Write testing.

invalid tracks attribute An attribute for target volumes. This attribute, when enabled, informs the host if a target volume did not complete synchronization with its source volume at the time of a second link failure.

invalidate Action for #SC VOL command that makes all tracks invalid for a target volume on a source volume.

I/O device An addressable input/output unit, such as a disk device.


104

Glossary

Kkilobyte (KB) 1024 bytes.

known device A device that meets at least one of the following criteria and is not specified in the EXCLUDE_DEVICE initialization statement:

• Found online during initialization

• Found online during an SC GLOBAL SSID_REFRESH

• Included in a Defined Group that was found online while processing a group command

• Found because it was used as the OS/390 or z/OS device number in an INCLUDE_RAG initialization statement

• Found online or offline because it was used as the OS/390 or z/OS device number in an EXCLUDE_SYM initialization statement

Llink path A single ESCON Light Emitting Diode (LED) fiber optic connection

between the two Symmetrix units. A minimum of two to a maximum of eight links can exist between the two units.

local volume A Symmetrix logical volume that is not participating in SRDF operations. All CPUs attached to the Symmetrix may access it for read/write operations. It is available for local mirroring or dynamic sparing operations to the Symmetrix unit in which it resides only.

logical volume A user-addressable unit of storage. In the Symmetrix subsystem, the user can define multiple logical volumes on a single physical disk device.

Mmedia The disk surface on which data is stored.

megabyte (MB) 106 bytes.

MII Machine Initiated Interrupt.


Glossary

mirroring The Symmetrix maintains two identical copies of a designated volume on separate disks. Each volume automatically updates during a write operation. If one disk device fails, Symmetrix automatically uses the other disk device.

mirrored pair A logical volume comprised of two physical devices with all data recorded twice, once on each device.

Ppromotion The process of moving data from a track on the disk device to cache.

See also ”stage.”

RR1 See ”source volume (R1).”

R2 See ”target volume (R2).”

RA1 unit In an SRDF configuration, it is the primary data storage subsystem. It initiates many of the SRDF synchronization activities. An SRDF configuration must have at least one RA1 unit and one RA2 unit. See also ”RA2 unit.”

RA2 unit In an SRDF configuration, this subsystem maintains synchronization with the volumes it is paired with in the RA1 unit. It can serve as an RA1 unit during disaster recovery. An SRDF configuration must have at least one RA1 unit and one RA2 unit. See also ”RA1 unit.”

RAID Redundant Array of Independent Disks.

read hit Data requested by the read operation is in cache.

read miss Data requested by the read operation is not in cache.

remote link director(RLD)

Each Symmetrix system requires a minimum of two up to a maximum of eight RLD directors, depending on the Symmetrix model in use. Each RLD manages two ESCON fiber link connections. Each RLD can perform a single I/O at a time to its paired RLD in the remote Symmetrix unit.


106

Glossary

SSAF Security Access Facility.

semi-synchronousmode

An SRDF mode of operation that provides an asynchronous mode of operation. Applications are notified that an I/O (or I/O chain) is complete once the data is in the cache of the RA1 Symmetrix unit. Any new data is then written to cache in the RA2 Symmetrix unit. The RA2 Symmetrix unit acknowledges receipt of the data once it is secure in its cache. If source tracks are pending transfer to a target volume and a second write is attempted to the source, Symmetrix disconnects (non immediate retry request), and waits for the pending track to transfer to the RA2 Symmetrix unit.

source volume (R1) A Symmetrix logical volume that is participating in SRDF operations. It resides in the “local” Symmetrix unit. All CPUs attached to the Symmetrix may access a source volume for read/write operations. All writes to this volume are mirrored to a “remote” Symmetrix unit. A source volume is not available for local mirroring operations.

SRDF Symmetrix Remote Data Facility. SRDF consists of the microcode and hardware required to support Symmetrix remote mirroring.

SSID Subsystem ID. For 3990 storage control emulations, this value identifies the physical components of a logical DASD subsystem. The SSID must be a unique number in the host system. It should be an even number and start on a zero boundary.

stage The process of writing data from a disk device to cache. See ”promotion.” See also ”destage.”

storage control The component in the Symmetrix subsystem that connects Symmetrix to the host channels. It performs channel commands and communicates with the disk adapters and cache. See also ”channel director.”

synchronous mode An SRDF mode of operation that ensures 100% synchronized mirroring between the two Symmetrix units. This is a synchronous mode of operation. Applications are notified that an I/O (or I/O chain) is complete when the RA2 Symmetrix unit acknowledges that the data has been secured in its cache.


Glossary

Ttarget volume (R2) A Symmetrix logical volume that is participating in SRDF operations.

It resides in the “remote” Symmetrix unit. It is paired with a source volume in the local Symmetrix unit and receives all write data from its mirrored pair. This volume is not accessed by user applications during normal I/O operations. A target volume is not available for local mirroring or dynamic sparing operations.

Vvalidate Action for #SC VOL command that makes all tracks for a source

volume valid on a target volume.


108

Glossary


Index

AAPIC program 45APID program 45APIDP program 45APIR program 45APIT program 45APITEST program 45APITP program 46APIV program 46APIVJ program 46

Bbuilding formatted REXX variables 14building the Host Component data object 14

CCALLAPIC program 46CALLAPID program 46CALLAPIR program 46CALLAPIT program 46CALLAPIV program 46CNTLUNIT object name 59control unit objects, retrieving 24

DDEVICE object name 62device objects, retrieving 25DIRECTOR object name 83director objects, retrieving 27director statistics objects, retrieving 32DRDF 35DSTAT object name 93, 98

dynamic RDF return codes 39dynamic RDF function 35

EEHCPSEL program 46EHCXSEL program 46EMCSRDF_CMD_RC 17EMCSRDF_CNTLUNIT.0 24EMCSRDF_CNTLUNIT.i 24EMCSRDF_COMMAND 15EMCSRDF_CPFX8 15, 24EMCSRDF_CPFX8 23EMCSRDF_DEVCOUNT 15EMCSRDF_DEVCOUNT 25EMCSRDF_DEVICE.0 25EMCSRDF_DEVICE.i 25EMCSRDF_DIRECTOR.0 27EMCSRDF_DIRECTOR.i 27EMCSRDF_DRDFRS 17, 39EMCSRDF_DRDFRTN_ MESSAGE 17EMCSRDF_DSTAT.0 32EMCSRDF_DSTAT.i 32EMCSRDF_FC 15EMCSRDF_GLOBAL.0 23EMCSRDF_INCLUDE_ RD10MBRS 15EMCSRDF_LINE 17EMCSRDF_LINK.0 26EMCSRDF_LINK.i 26EMCSRDF_MESSAGE 17EMCSRDF_MSG 17EMCSRDF_RC 17, 18, 37EMCSRDF_RDFGROUP.0 28EMCSRDF_RDFGROUP.i 28


110

Index

EMCSRDF_RDFGROUPi_BOXLIST.# 28EMCSRDF_RDFGROUPi_BOXLIST.0 28EMCSRDF_RDFGROUPi_MSCLCL 28EMCSRDF_RDFGROUPi_STARLCL 28EMCSRDF_RDFGROUPi_STARRMT 28EMCSRDF_RDFGRPS 15, 25, 26, 27, 28, 30, 32EMCSRDF_REQ_TOKN 15EMCSRDF_RGRPSTAT.0 30EMCSRDF_RGRPSTAT.i 30EMCSRDF_SELGROUP 15, 28EMCSRDF_SELSYM 15, 25, 26, 27, 28, 30, 32EMCSRDF_SERIAL.0 23EMCSRDF_SERIAL.i 23EMCSRDF_SSID.0 24EMCSRDF_SSID.i 24EMCSRDF_STARTDEV 15EMCSRDF_STARTDEV 25EMCSRDF_SUBSYS.0 20EMCSRDF_SUBSYS.i 20EMCSRDF_TOKEN 15EMCSRDF_TRK# 16, 17EMCSRDF_USER_ VERIFY 16EMCSRDF_WAIT 16, 27EMCSRDF_WAIT_CMD_TIMEOUT 16EMCSRDF_WAIT_FOR_COMMAND 16EMCSRDFC return codes 39EMCSRDFC program 14EMCSRDFC variable formatter 10EMCSRDFR interface program 10, 14

input variables 15return codes 37

FFC01.1_CMD_CHARS 52FC01.1_HCVER 52FC01.1_SUBSYS_NAME 52FC01.2_CMD_CHARS 52FC01.2_HCVER 52FC01.2_SUBSYS_NAME 52formatted variables 52Function 01, Retrieve Subsystem Object 20, 54Function 02, Submit Host Component

Command 21Function 03, Get Command Status 22Function 04, Retrieve Command Output 22

Function 06, Retrieve Global Information Object 23, 54

Function 07, Retrieve Serial# Objects 23, 57Function 08, Retrieve SSID Objects 24, 58Function 09, Retrieve Control Unit Objects 24, 59Function 10, Retrieve Device Objects 25, 62Function 11, Retrieve RDF Link Objects 26, 81Function 12, Retrieve Director Objects 27, 83Function 13, Wait Routine 27Function 14, Retrieve RDF Group Object 28Function 15, Retrieve RDF Group Statistics

Objects 30, 92Function 16, Retrieve SRDFA Session Objects 31Function 17, Retrieve Director Statistics

Objects 32, 93Function 18, Reply to Command 34Function 19, Dynamic RDF (DRDF) 35Function 20 - Get Device Identification 36, 98

GGet Command Status function 22Get Device Identification function 36global information objects, retrieving 23GLOBAL object name 54

HHAPIR program 47HAPIT program 47HEADER object name 53

LLINK object name 81

Oobject headers 48object interpretation members 53Object name

CNTLUNIT 59DEVICE 62DEVICE ID 98DIRECTOR 83DSTAT 93GLOBAL 54HEADER 53


Index

LINK 81RDFGROUP 84RGRPSTAT 92SERIAL 57SSID 58SUBSYS 54

OBJECTH object header 48OBJECTXX 53

RRDF group object, retrieving 28RDF group statistics objects, retrieving 30RDF link objects, retrieving 26RDFGROUP object name 84remote requests 15Reply to Command function 34Retrieve Command Output function 22Retrieve Control Unit Objects function 24Retrieve Device Objects function 25Retrieve Director Objects function 27Retrieve Director Statistics Objects function 32Retrieve Global Information Object function 23Retrieve RDF Group Object function 28Retrieve RDF Group Statistics Objects function 30Retrieve RDF Link Objects function 26Retrieve Serial# Objects function 23Retrieve SRDFA Session Objects function 31

Retrieve SSID Objects function 24Retrieve Subsystem Object function 20return codes 37

EMCSRDFC 39EMCSRDFR 37

REXX programming language 10RGRPSTAT object name 92

Ssample programs 45SAMPLIB 12, 48serial number 15serial number objects, retrieving 23SERIAL object name 57SRDF Host Component API 10SRDFA session objects, retrieving 31SSID object name 58SSID objects, retrieving 24Submit Host Component Command function 21SUBSYS object name 54subsystem object, retrieving 20

WWait Routine function 27wait times 16

111REXX Interface Programmer’s Reference Guide

112

Index


Documents

REXX Interface Programmer's Reference Guide · EMC Corporation Corporate Headquarters: Hopkinton, MA 01748-9103 1-508-435-1000 REXX Interface Programmer’s Reference Guide P/N 300-002-205