Migrate/Replace disks in OCR,Voting and ASM.

Step1. Identify existing disk devices.
OCR Disks:

$ocrcheck

Voting Disks:

$crsctl query css votedisk


Step2. Make sure permissions are same as the old disk devices on new devices.(Unix check)

Step3 Backup OCR and voting devices.

OCR backup all disks:

$ ocrconfig -showbackup


$ocrconfig -export <backup_file_name>

All Voting disk backup:

$crsctl query css votedisk


dd if=/u02/oradata/racdb/CSSFile of=/home/oracle/VotingDiskBackup.dmp bs=4k




Step4 Replace OCR and Voting disk

OCR Disk Replace:

$ocrconfig -replace ocrmirror <disk>


$ocrconfig -replace ocr <disk>

Voting disk Replace:

Get the list first

$crsctl query css votedisk

then add new disks as follows

$crsctl add css votedisk /dev/raw/raw3 -force

Then remove old voting disks as follows

$crsctl delete css votedisk <path>



ASM disks replace.

Step1: Identify disks of disk group.


connect to asm

sql>select path, header_status, mode_status from v$asm_disk;



Step2: Make sure the new disks are shared across all cluster nodes and have same ownership and privilages as old disks.(Unix confirmation checklist)


Step3: add new disks

SQL> alter diskgroup DATA add disk path;

SQL> alter diskgroup FRA add disk path;

Step4: Drop old disks (Use disk names from query in step1)

alter diskgroup data drop disk DATA_0000, DATA_0001 ;


Step5: Check rebalance, asm operations, increase power if needed.


alter diskgroup DATA rebalance power 5;

alter diskgroup FRA rebalance power 5;


select * from v$asm_operations;


Step6: Once rebalance is complete check,verify new paths.