Using Serviceguard Extension for RAC, 3rd Edition, May 2006

Serviceguard Configuration for Oracle 10g RAC
Planning Storage for Oracle Cluster Software
Chapter 2 41
Planning Storage for Oracle Cluster Software
Oracle Cluster Software requires shared storage for the Oracle Cluster
Registry (OCR) and a vote device. Automatic Storage Management can
not be used for the OCR and vote device since these files must be
accessible before Oracle Cluster Software starts. The minimum required
size for the OCR is 100MB and for the vote disk is 20 MB.
The Oracle OCR and vote device can be created on supported shared
storage, including SLVM logical volumes, CVM raw volumes, and CFS
file systems.