8/11/2019 HDS Software Product Overview TrueCopy

1/2

ES/OLEvaluator Series On-Line

Product InformationSoftware

Apri l 18, 2005Page 1 of 2

Overview of Hitachi Data Systems TrueCopy

2000-2005 Evaluator Group, Inc. All rights reserved. Reproduction of this publication in any form without prior written permission is prohibited.

7720 E. Belleview Avenue Suite 210 Greenwood Village, CO 80111 (303) 221-7867 Fax (303) 221-1615 www.evaluatorgroup.com

This document provides an overview of the Hitachi Data Systems TrueCopy software

features for the TagmaStore USP and Lightning 9900 series of storage systems.family (9900 and 9900 V). It is a component of the Hitachi Business Continuity Suite of

Competitive alternatives include the EMC SRDF, IBM Global Copy and Metro Copy,and StorageTek Power PPRC products.

Product Highlights

Support for mainframe and open systems

Synchronous (TrueCopy Basic) and asynchronous (TrueCopy Asynchronous)modes of operation

TrueCopy Asynchronous is a Hitachi Data Systems proprietary hardware onlyasynchronous solutions

Support for IBMs Geographically Dispersed Parallel Sysplex (GDPS)

Product Overview

TrueCopy consists of a suite of remote copy products that are unique to the HitachiUSP and 9900 series.

TrueCopy Basic (Synchronous)

TrueCopy Basic is a remote copy option that operates in synchronous mode. Itcan duplicate any number and types of logical volume images from a primarysource to a secondary source at distances up to 43 kilometers. Both the primaryand secondary subsystems must be a USP or a 9900. TrueCopy Basic does notrequire any software (or microcode) outside of that in the USP or 9900 system.

TrueCopy Asynchronous

Hitachi Data Systems offers two versions of asynchronous remote copy:TrueCopy Asynchronous and Hitachi Extended Remote Copy (HXRC). TheHXRC product, which is fully compatible with the IBM XRC offering, is not part of

the TrueCopy suite and must be ordered separately.

TrueCopy Asynchronous is Hitachi Data Systems proprietary microcode basedasynchronous implementation with the algorithms and rules of the System DataMover incorporated into the system microcode. All records are time stamped toallow it to reassemble data that is sequence sensitive. It also supportsconsistency groups, but all volumes in a group must reside on the samesubsystem since it does not have the ability to communicate between

8/11/2019 HDS Software Product Overview TrueCopy

2/2

ES/OLEvaluator Series On-Line

Product InformationSoftware

Apri l 18, 2005Page 2 of 2

Overview of Hitachi Data Systems TrueCopy

2000-2005 Evaluator Group, Inc. All rights reserved. Reproduction of this publication in any form without prior written permission is prohibited.

7720 E. Belleview Avenue Suite 210 Greenwood Village, CO 80111 (303) 221-7867 Fax (303) 221-1615 www.evaluatorgroup.com

subsystems. The NanoCopy feature is required to support consistency groups

across multiple subsystems.

With ESCON channels the primary and secondary subsystems can be separatedby up to 43 kilometers. Third party channel extender products (i.e. CNTChannelink and UltraNet Director) can be used to extend the distance tothousands of miles via communication lines.

Evaluator Group's Perception of Strengths and Weaknesses

Evaluator Group's perception of the strengths and weaknesses of the HitachiData Systems TrueCopy feature are as follows.

Perceived Strengths

TrueCopy Asynchronous provides asynchronous mode of operationwithout requirement for host based software (System Data Mover)

TrueCopy Asynchronous provides a cost effective means of providingdisaster recovery capabilities across extended distances

Remote copy support for IBMs Geographically Dispersed ParallelSysplex (GDPS) facil ity

The combination of TrueCopy Asynchronous and NanoCopy will provide arelatively simple and cost effective means of implementing disasterrecovery across extended distances. Evaluator Group believes that withthese new products, Hitachi Data Systems has assumed the leadershipposit ion in the area of disaster recovery.

Perceived Weaknesses

Performance impact in synchronous mode (same as any other synchronousimplementation)

Consistency groups with TrueCopy Asynchronous without NanoCopy are

limited to volumes within a single subsystem

The Evaluator Series and Evaluator Series On-Line (ES/OL) are trademarks ofEvaluator Group, Inc. All other trademarks are the property of their respectivecompanies.