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Oracle Clusterware 11g – Overview

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The following is intended to outline our general product direction. It is intended for information purposes only, and may not be incorporated into any contract. It is not a commitment to deliver any material, code, or functionality, and should not be relied upon in making purchasing decisions.The development, release, and timing of any features or functionality described for Oracle’s products remain at the sole discretion of Oracle.

What is Oracle Clusterware? • Oracle Clusterware is “the cluster“ in Oracle Real Application Clusters• Introduced with Oracle Database 10g Release 1• Exclusively used by 75% of Oracle’s Real Application Clusters customers• Supported on all OS certified for Oracle Real Application Clusters (RAC)• Cluster infrastructure for all kind of applications and Clusterware for RAC

Server 1 Server 2 Server .. Server n Server n+1

Protected App A

Protected App B

• Oracle Clusterware is a complete cluster software solution

• Including advanced functionality:• Failure Notification (FaN)• Support for 3rd party cluster

software• HA-API for all kind of applications• Fully integrated with Oracle RAC

• Lowest costs and flexible:• No need to purchase

additional software• Easy to install & to manage• Supports 100 nodes on all

OS’ certified for Oracle RAC • Single-vendor support

Oracle Clusterware provides an integrated stack

Applications

Services Framework

Cluster Control/Recovery APIs

Automatic Storage Management

Messaging and Locking

Membership

Connectivity

Eve

nt

Ser

vice

s

Man

agem

ent

AP

Is

Hardware/OS Kernel

RAC Other Apps

• Effective with 11g: Oracle Clusterware can protect any Oracle software, or 3rd-party software that uses an Oracle database. (– at no extra costs)

• In detail:• Oracle Clusterware can be installed and used to protect any

Oracle or third-party software provided any of the following conditions are met:

1. The software being protected is from Oracle.2. The software being protected uses an Oracle Database.3. The software being protected is running on Oracle

Unbreakable Linux.4. The software being protected is running in a cluster where

at least one machine involved in the cluster is licensed using the appropriate metric for either Oracle Database Enterprise Edition or Oracle Database Standard Edition.

Oracle Clusterware licensingSee: Oracle Database Licensing information (Part Number B28287-01)

Hardware infrastructure for Oracle Clusterware Minimum hardware requirements

Node 1

Server Interconnect(with Switch)

Node 2 Node... Node n-1 Node n

Public Lan Public Lan Public Lan

SharedStorage

For Voting Disks and

Oracle Cluster Registry

• Oracle Clusterware is protecting Applications A, B & C on nodes 1, 2 & 3• It is also providing resources for the RAC database running on nodes 1 & 2

• Sample Scripts that can be used with Oracle Clusterware can be found in the CD pack or can be downloaded from http://otn.oracle.com/clusterware

Possible configuration

listener

ORA_CRS_HOME

listener

cluster database

ORA_CRS_HOME

ORACLE_HOME

ORA_CRS_HOME

listener

database

ORA_CRS_HOME

ORACLE_HOME

Protected App A Protected App B Protected App C

cluster database

ORACLE_HOME

Node 1 Node 2 Node 3 Node 4

Consolidated Pool of Storage withAutomatic Storage Management (ASM)

• Customers are turning more and more to Oracle Clusterware for the cluster layer:

• Used by 75%* of Oracle’s current Oracle Database 10g RAC customers

• But… customers sometimes use the clusterware layer to protect other applications

• The – It’s not just an Oracle Database syndrome• Oracle did not support this in the Clusterware

shipped as part of Version 10gR1 of the Database

• Therefore, Oracle Clusterware provides HA for applications:• Restart on application failure• Relocate on node failure

• Example• Use it to provide cold failover for Oracle Single Instance• Protect SAP Components

* Tracked directly by Oracle Development

Why does the HA framework exist?

• Network Location• Clients need a node independent

way of connecting to an Application

• Dependencies• Components may need to be started

in a certain order

• Configuration files• Applications typically need configuration

files stored on disk

What do applications need?

What does Oracle Clusterware provide?

• VIP resource• Provides Application VIPs

• Framework• Allows you to provide Oracle Clusterware

protection to your application

• HA API• Interface to allow you to change - at run time –

how Oracle Clusterware manages your application

• OCFS (Clusterware independent / on Windows & Linux – use 3rd-party CFS alternatively)

• Provides a location for files visible across all nodes

Oracle Clusterware Architecture since Oracle Database 10g Release 2

Cluster Synchronisation Services (CSS)Basis for Inter-process & -node-operations, Node Monitoring & Membership

Hardware / Operating System Kernel

Cluster Ready Services (CRS)HA Framework

Virtual IP addresses Instances Processes

140.84.20.05 ORA-VIP140.84.20.04 ORA-VIP

140.84.20.06 ORA-VIP

SQL Cache

Large Pool

Buffer Cache

Java Pool

SGA Pool

SQL Cache

Large Pool

Buffer Cache

Java Pool

SGA Pool

ONS

140.84.20.02 USER-VIP140.84.20.01 USER-VIP

140.84.20.03 USER-VIP

And with Oracle RAC? No further steps are required – everything is installed out of the box

• Oracle Clusterware is also the underlying cluster solution for Oracle Real Application Clusters

• Including advanced functionality:• Failure Notification (FaN)• Support for 3rd party cluster software

• Low cost and flexible:• No need to purchase

additional software• Easy to install & to manage• Single-vendor support• Available on all OS certified for RAC• All resources required for RAC are

pre-configured for immediate use

Instances working together makes the differenceIn other words: why RAC and not Failover Cluster?

SharedStorage

Node 1 Node 2

Dictionary Cache

Log buffer

LCK0 LGWR DBW0

SMON PMON

Library Cache

Global Resource Directory

LMS0

Buffer Cache

LMON LMD0 DIAG

Dictionary Cache

Log buffer

LCK0 LGWR DBW0

SMON PMON

Library Cache

Global Resource Directory

LMS0

Buffer Cache

LMON LMD0 DIAG

• RAC provides higher availability due to minimised failover times• RAC uses all nodes if available – failover clusters only 1 (per DB)

Failover cluster• Failover time

up to 30 MIN.

RAC• Scalable over

n nodes• Impact of node failure:

< 1 min.!

Filesystem

Dictionary Cache

Log buffer

LCK0 LGWR DBW0

SMON PMON

Library Cache

Global Resource Directory

LMS0

Buffer Cache

LMON LMD0 DIAG

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Email: Presenters.Name@oracle.com