Backup and recovery of OCR - 10g

To see current location of OCR use the following command

ocrcheck

OCR BACKUP

The following command lists all OCR backup. Note: All OCR operations should be performed as root user.

ocrconfig -showbackup

Before dealing with OCR backup, let us see how to perform OCR mirroring.

OCR should be up and running to perform mirroring.

Say the cluster has only one OCR file /ocr/ocrdisk1. Now let us mirror to /ocr/ocrdisk2

touch /ocr/ocrdisk2

ocrconfig -replace ocrmirror /ocr/ocrdisk2

OCR Backup will be done using following methods

1. Oracle Cluster-ware automatically creates OCR backup for every 4 hours and retains last 3 backup. Also we can see daily, weekly, monthly backup. CRSD process creates this backup in location $ORA_CRS_HOME/cdata/crs

2. Use export command

ocrconfig -export /tmp/ocr-export.dmp

3. Backup using copy command.

--If OCR is in raw partition

dd if=/ocr/ocrdisk1 of=/mountpoint/filename

-- If ocr is in ocfs use tar or cp

cp -p /ocr/* /BackupDir

tar -cvf ocr.tar /ocr

OCR RESTORE

OCR restore can be done using following methods.

1. restore from OCR backup

--Touch the ocr files if files are not present. Else restore won’t be successful.

touch /ocr/ocrdisk1

touch /ocr/ocrdisk2

ocrconfig -restore $ORA_CRS_HOME/cdata/crs/day.ocr

2. import from ocr dump

ocrconfig -import /tmp/ocr-export.dmp

3. Copy command

dd if=/ocr/ocrdisk1 of=/mountpoint/filename

cp –p /BackupDir/*.ocr /ocr (only in ocfs)