Moving OCR and Voting Disk in Oracle

Moving OCR

You must be logged in as the root user because the root owns the OCR files. Also, an ocrmirror must be in place before trying to replace the OCR device.

Make sure there is a recent backup of the OCR file before making any changes:

ocrconfig –showbackup

If there is not a recent backup copy of the OCR file, an export can be taken for the current OCR file. Use the following command to generate an export of the online OCR file:

In 10.2 

# ocrconfig –export -s online

In 11g

# ocrconfig -manualbackup

The new OCR disk must be owned by root, in the oinstall group, and have permissions set to 640. Provide at least 100 MB of disk space for the OCR.

On one node as root run:

# ocrconfig -replace ocr 
# ocrconfig -replace ocrmirror 

Now run ocrcheck to verify if the OCR is pointing to the new file

Moving Voting Disk

Note: crsctl votedisk commands must be run as root

Shut down the Oracle Clusterware (crsctl stop crs as root) on all nodes before modifying the voting disk. Determine the current voting disk location using:

crsctl query css votedisk

Take a backup of all voting disks:

dd if=voting_disk_name of=backup_file_name

To move a Voting Disk, provide the full path including the file name:

crsctl delete css votedisk –force
crsctl add css votedisk –force

After modifying the voting disk, start the Oracle Clusterware stack on all nodes

# crsctl start crs

Verify the voting disk location using 

crsctl query css votedisk