Oracle Faq

The Oracle Clusterware includes two important components: the voting disk and the Oracle Cluster Registry (OCR). The voting disk is a file that manages information about node membership and the OCR is a file that manages cluster and RAC database configuration information.

Oracle recommends that you select the option to configure multiple voting disks during Oracle Clusterware installation to improve availability.

Backing up Voting Disks

Run the following command to back up a voting disk. Perform this operation on every voting disk as needed where voting_disk_name is the name of the active voting disk and backup_file_name is the name of the file to which you want to back up the voting disk contents:

dd if=voting_disk_name of=backup_file_name

Recovering Voting Disks

Run the following command to recover a voting disk where backup_file_name is the name of the voting disk backup file and voting_disk_name is the name of the active voting disk:

dd if=backup_file_name of=voting_disk_name

Note: If you have multiple voting disks, then you can remove the voting disks and add them back into your environment using the crsctl delete css votedisk path and crsctl add css votedisk path commands respectively, where path is the complete path of the location on which the voting disk resides.

Changing the Voting Disk Configuration after Installing Real Application Clusters

You can dynamically add and remove voting disks after installing Real Application Clusters. Do this using the following commands where path is the fully qualified path for the additional voting disk. Run the following command as the root user to add a voting disk:

crsctl add css votedisk path

Run the following command as the root user to remove a voting disk:

crsctl delete css votedisk path

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