topic Re: Reduce disk group size in HPE EVA Storage

Reduce disk group size

tt1205 — Sat, 13 Apr 2013 02:50:05 GMT

Hello everyone,

Got a EVA 4400 disk group which is 95% allocated. Want to reduce the size of a virtual disk under this group to bring it under 90%. The vdisk is an RDM being utilised by a SQL server box running on Win 2008. I intend to shrink the volume on the 2008 server first (clustered NTFS disk) and then decrease allocated capacity on SAN through command view.

First time doing this and wondering if anyone can see any potential issues please?

Thanks in advance...

Re: Reduce disk group size

giladzzz — Sun, 14 Apr 2013 12:17:44 GMT

what you say is correct but make sure you have a good backup shrinking a disk is always a risk

Regrards

Re: Reduce disk group size

tt1205 — Mon, 15 Apr 2013 05:40:42 GMT

Thank you for the response. Would it be worthwhile running a defrag of the disks in question before shrinking?

Re: Reduce disk group size

giladzzz — Mon, 15 Apr 2013 12:01:12 GMT

I think defrage is run automticly by windows 2008.

as I said before anything have a good backup.

Regards

Re: Reduce disk group size

Sheldon Smith — Mon, 15 Apr 2013 12:36:53 GMT

Regardless, make sure the volume is as defragged as you can get it.
1 Defrag and backup
2 shrink on 2008
3 shrink on EVA
Be VERY careful not to shrink on EVA smaller than partition size in 2008.

In the past, I have noticed that if I
1 create, present and format a vdisk
2 enlarge the vdisk
3 enlarge the partition
4 shrink the partition
the partition is still slightly larger that what was initially created.

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