Veritas Storage Foundation 5.1 SP1 for Oracle RAC Administrator"s Guide (5900-1512, April 2011)

are brought online by VCS before Oracle Clusterware/Grid Infrastructure starts.

This prevents the premature startup of Oracle Clusterware/Grid Infrastructure,

which causes cluster failures.

Oracle Cluster Registry

The Oracle Cluster Registry (OCR) contains cluster and database configuration

and state information for Oracle RAC and Oracle Clusterware/Grid Infrastructure.

The information maintained in the OCR includes:

■ The list of nodes

■ The mapping of database instances to nodes

■ Oracle Clusterware application resource profiles

■ Resource profiles that define the properties of resources under Oracle

Clusterware/Grid Infrastructure control

■ Rules that define dependencies between the Oracle Clusterware/Grid

Infrastructure resources

■ The current state of the cluster

For versions prior to Oracle RAC 11g Release 2, the OCR data exists on a shared

raw volume or a cluster file system that is accessible to each node.

In Oracle RAC 11g Release 2, the OCR data exists on ASM or a cluster file system

that is accessible to each node.

Use CVM mirrored volumes to protect OCR data from failures.Oracle

Clusterware/Grid Infrastructure faults nodes if OCR is not accessible because of

corruption or disk failure. Oracle automatically backs up OCR data. You can also

export the OCR contents before making configuration changes in Oracle

Clusterware/Grid Infrastructure. This way, if you encounter configuration

problems and are unable to restart Oracle Clusterware/Grid Infrastructure, you

can restore the original contents.

Consult the Oracle documentation for instructions on exporting and restoring

OCR contents.

Application resources

Oracle Clusterware/Grid Infrastructure application resources are similar to VCS

resources. Each component controlled by Oracle Clusterware/Grid Infrastructure

is defined by an application resource, including databases, instances, services,

and node applications.

Overview of Veritas Storage Foundation for Oracle RAC

Component products and processes of SF Oracle RAC