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  Oracle Database Tips by Donald Burleson

Oracle10g Grid Computing with RAC
Chapter 6 - Install, Configure and Database Creation

VCS Framework and Service Groups

In Veritas DBE/AC, two service groups are defined to support and control the RAC database. One service group deals with the volume manager resources, file system resources, listener resources, and shared Oracle Home directory. The other service group deals with the Oracle database and supports CVM and CFS resources. These two groups are specified to be parallel groups as shown in Fig. 6.15. VCS does not attempt to migrate a 'failed service group'.

Figure 6.15 Veritas DBE/AC Service Groups

DBEAC provides agents to operate and control all resources. Agents are the VCS processes that bring resources online and take them offline. Resources are brought online and offline in an orderly manner based on the resource dependency. Agents also monitor resources and report. Some of the agents are specific to advance clusters including CVMCluster, CVMVoldg and CFSMount. The Agents stop and start the resources as required. The VCS implementation for Oracle Failover clusters does not include these agents.


When using the AIX 5L as the operating system, there are two combinations possible:

Raw devices with the use of HACMP/ES CRM 4.4.x cluster OSD.

GPFS - General Parallel File System with the use of HACMP/ES 4.4.x OSD.

The above text is an excerpt from:

Oracle 10g Grid & Real Application Clusters
Oracle 10g Grid Computing with RAC
ISBN 0-9744355-4-6

by Mike Ault, Madhu Tumma


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