Change the disks used in the disks of OCR/vote DiskGroup

Hello

RDBMS...: 11.2.0.4

... OS: AIX 7.1

In our environment, we have a diskgroup used to store records OCR and voting. The diskgroup contains 3 discs 15 GB each and is configured with normal redundancy and is called "OCR".

My question is: We must change these 3 discs with 3 new disks to a different memory. I would like to know if it is possible to add these new 3 drives in the diskgroup OCR, wait for rebalancing and after this operation, remove the old records? This approach is viable? Or we need to create a new diskgroup, place the OCR and the discs with right to vote in this new diskgroup and remove the old diskgroup?

Thanks in advance.

You can add and remove asmdisk by using the procedure in the DSO without problem, make sure just as there are enough failgroup to contain the votedisk.

OCR and ASMSPFILE connection:

The OCR and the ASMSPFILE are stored similar to how Oracle database files are stored. Scopes are spread across all disks in the diskgroup and redundancy (which is the measurement scale) is based on the redundancy of the disk group. When you add and remove some asmdisk these extensions are moved automatically during the rebalancing process.

No relocation is necessary for OCR to ASM SPFILE.

VOTEDISK topic:

The VOTEDISK is not stored as OCR, each VOTEDISK (one per ASMDISK) are placed directly on the ASMDISK (near LUN header) then is necessary relocation Votedisk.

Suppose you have 3 asmdisk each own FAILGROUP disc (A, B and C) and you add more ASMDISK 3.

So if you use a normal redundancy, you need to configure at least 3 new failgroup (a failgroup for each new ASMDISK).

When you issue "Alter diskgroup xx drop... drive A, B and C" the clusterware start automatic resettlement treat mobile votedisk to disks on failgroup D, E and F.

You will see the process on the alert_log of ASM and cssd.log.

After finishing process of rebalancing, check if they fall on disk have a status of 'TRAIN' and there is no votedisk thereon ($ crsctl query css votedisk).

Tags: Database

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