We Need To Backup Voting Disk and OCR For Oracle RAC For Disaster Situation :
Add Voting Disk :
# crsctl add css votedisk
To remove a voting disk:
# crsctl delete css votedisk
If Oracle Clusterware is down on all nodes, use the –force option:
# crsctl add css votedisk -force
# crsctl delete css votedisk -force
Backup Voting Disk :
$ crsctl query css votedisk
$ dd if= of= bs=4k
OCR BACKUP :
Oracle RAC Taking Backup For OCR By Default , You will Find It On :
cd $ORACLE_BASE/Crs/cdata/jfv_clus
Change the default automatic backup location:
# ocrconfig –backuploc /shared/bak
Back Up OCR Manually :
# ocrconfig –export file name
Recover OCR Using Physical Backups:
1.Locate a physical backup:
$ ocrconfig –showbackup
2.Review its contents:
# ocrdump –backupfile file_name
3.Stop Oracle Clusterwareon all nodes:
# crsctl stop crs
4.Restore the physical OCR backup:
# ocrconfig –restore <CRS HOME>/cdata/jfv_clus/day.ocr
5.Restart Oracle Clusterware on all nodes:
# crsctl start crs
6.Check OCR integrity:
$ cluvfy comp ocr -n all
Thank You
Osama Mustafa
Technology Geek 