topic Re: Rebuilding Disk Groups on a active MSA 2050 storage array in HPE MSA Storage

Rebuilding Disk Groups on a active MSA 2050 storage array

KBEZ — Fri, 26 Mar 2021 11:11:54 GMT

We need to rebuild the disk groups on one of our MSA 2050 storage systems. The storage have 2 disk groups currently configured as RAID 6+2. We have to rebuild the disk groups as RAID 10+2. There is active volumes on the array. Is there a way that the disk groups can be rebuild without losing data?

Re: Rebuilding Disk Groups on a active MSA 2050 storage array

SUBHAJIT KHANBARMAN_1 — Fri, 26 Mar 2021 11:42:00 GMT

@KBEZ

There is no option to modify RAID from existing VDG. So it's better to take data backup, delete all VDG and Volumes. Then re-create VDG and volumes as per new RAID and then restore data from backup. This is better and easy approach.

Hope this helps!
Regards
Subhajit

I am an HPE employee

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Re: Rebuilding Disk Groups on a active MSA 2050 storage array

ArunKKR — Sat, 27 Mar 2021 10:48:05 GMT

Hi,

MSA 2050 does not support RAID type migration of a disk group.

If you have spare slots and additional hard drives , you could create RAID 10 disk groups under the same Pool.

RAID 6 disk groups could then be deleted.

Any data in RAID 6 disk group will be migrated to other disk groups once disk group deletion is initiated. This is a very slow process (vdrain) and cannot be interrupted.

The new disk group created should have enough space to accommodate the data in RAID 6 disk group.

The easiest method is to take data back up, delete the RAID6 disk group/Pool, create new RAID 10 disk group and restore from back up as suggested by Subhajit.

Re: Rebuilding Disk Groups on a active MSA 2050 storage array

ArunKKR — Mon, 29 Mar 2021 11:55:45 GMT

Hi,

To add on, if both disk groups are under single Pool, you could try to delete one of the RAID 6 disk groups so that the vdrain gets initiated.

This has the pre-requisite that the disk group 1 has enough free space to accommodate the data in disk group 2.

I would suggest to log a support case to check the configuration and free space if disk group deletion is planned.