Sample Configuration with HP Serviceguard Extension for RAG and Oracle Real Application Clusters 11g release 2 using Cluster File System

OC requirements: OCR and voting disk

OCR

Each OCR requires at least 300 MB of disk space.

The OCR must be shared and accessible by all

cluster nodes. OC uses the OCR to keep Oracle cluster information and cluster database

configuration information. OCR is also used to keep track of processes OC controls.

Voting disk

Each voting disk requires at least 300 MB of disk space.

As with the OCR, the voting disk must be

shared and accessible by all cluster nodes. Oracle uses the voting disk to manage Oracle cluster

software membership. The voting disk is also used as a health check device. In the case of a network

failure, it is used to arbitrate cluster ownership between instances.

OCR and voting disk placement

Each OCR and voting disk can be created on a CFS, Shared Logical Volume Manager (SLVM) or on

Automatic Storage Management (ASM). The OCR and voting disks can reside on a CFS as regular

files. The advantages to placing these files on a CFS include multipath support, mirroring, and

controlled access.

RAC database files

SGeRAC provides various storage options for storing RAC instance data files. CFS is one of them. At

least 1.5 GB storage is required for RAC database files.

Oracle binaries (Grid Infrastructure and RAC database)

Oracle binaries can reside on a local, private file system replicated on each node, or they can be

deployed on a CFS with a single shared copy.

Storing Oracle binaries on local storage is convenient in production environments. This configuration

is useful if you want to patch or upgrade an application on each node, one by one. Patching may or

may not be possible, depending on the requirements for each Oracle patch.

Using a single shared copy for Oracle binaries is easier and faster, and it requires less administrative

effort and less storage. This configuration is suitable in the development environment and might be

suitable for some production environments.

In this sample configuration, OC binaries are placed on local storage and RAC DBMS binaries are

placed on CFS (shared storage). Oracle Grid Infrastructure binaries require 6 GB of disk space, and

Oracle RAC Database binaries require 8.2 GB of disk space.

Recovery files

Oracle recovery files may be needed for database recovery and should be available to the node that

performs database recovery. CFS is the recommended deployment option for recovery files, because

it provides ease of management and faster recovery. At least 2 GB of storage is required for recovery

files.