ASM DISK MIGRATION [OCR/DATA/RECO DISK GROUPS] in RAC

 

Current Disk group as below. You must prepare candidate disks with proper permissions by storage level.

Here we are going to add below new disks for each disk group with rebalance power 6 and we can do afd label below disks and assign to ASM disk group using asmca or sqlplus commands.

After added new disks to relevant disk groups you may drop the old disks in DATA and RECO disk groups with rebalance power using asmca or sqlplus. But note here,  we do not drop old disk of OCR disk group due to existing voting disks. Therefore, you must need to transfer voting disks in to another ASM disk group which has sufficient space.

Before moving voting disk  check OCR devices and existing voting disk location. Note you need to have OCR mirroring device before move voting disk to another ASM disk group and get a manual backup of OCR.

To check OCR device = > ocrcheck

To check voting disks => crsctl query css votedisk

To check OCR backup=> ocrconfig -showbackup <AUTO|MANUAL>

To get manual backup => ocrconfig -manualbackup

Use below command to add OCR mirror device.

ocrconfig -add +RECO

After adding OCR mirror device get a backup of OCR.

After that using grid user, move voting disk to another disk group and once completed check voting disks location.

To move voting disks => crsctl replace votedisk <+ASM disk group>

ASM alert as below when move vote disks and creation of OCR mirror.

After moving voting disks you may drop OCR old disks and it will rebalance and once dropped old OCR ASM disk group disks,  move voting disk back to old location and remove the OCR mirror device if required.