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1534
September 8th, 2012 10:00
Two disks failed from same RAID group
We have identified two separate disks that have failed simultaneously. 1B-C3 and 16C-C5 in symmetrix.
Unfortunately they are both in the same raid group. Raid-5 (7+1).
We are currently unable to initiate a replacement of either Drive, because of potential data loss on the other drive.
Total 5 devices affected. These are assigned to different servers.
Any procedure to replace the disks without data loss. I really appreciate your help.
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RRR
2 Intern
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5.7K Posts
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September 8th, 2012 10:00
An SR should have been created for this and since it's in the same raid group I think it's a prio 1 service request (sev 1). I would EMC have a saying in this but I thing yourmdata is toast and estoring it from a backup might be needed.
dynamox
9 Legend
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20.4K Posts
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September 8th, 2012 21:00
if it's not hard crash, support might be able to spin it back up.
AnkitMehta
1.4K Posts
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September 8th, 2012 22:00
DFRG's seems to be a trending issue now a days.
I am doing that from last 4 days constantly till today! Even glen would agree with me on that! :/
DELL GURU
4 Posts
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September 15th, 2012 08:00
#symdisk list -failed not shows any failed disks. No hotspare also invoked. Here is the output of symdev show output.
Device : 04AC (m)
{
--------------------------------------------------------------
Disk DA Hyper Member Spare Disk
DA :IT Vol# Num Cap(MB) Num Status Status Grp# Cap(MB)
--------------------------------------------------------------
15A:D1 578 57 1247 1 RW NR 1 139814
16A:D2 662 56 1247 7 RW NR 1 139814
01B:C3 128 58 1247 6 NR RW 1 139814
15B:C3 124 58 1247 8 RW NR 1 139814
02C:D2 626 56 1247 5 RW NR 1 139814
16C:C5 196 58 1247 4 NR NR 1 139814
01D:D2 688 56 1247 3 RW NR 1 139814
02D:C0 57 57 1247 2 RW NR 1 139814
}
The particular disks 01B:C3 , 16C:C5 are in NR and 01B:C3 is having spare status RW. Till now i didn't get any issues from platform team and application team.
Like the same for all 5 affected devices.
Please let me know how to proceed.
RobertDudley
2 Intern
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448 Posts
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September 17th, 2012 09:00
Have you contacted EMC yet? I believe you can only have one spare applied against a raid group at a time by the automatic sparing. It does appear that one drive spared out so while you have two failed drives only one is truly unavailable. You should be able to have one of the disks replaced again I would contact EMC support and let them determine which one to replace first.
I would expect that if you replace the drive that is spared it will build from the spare. If you replace the drive that is down and not spared it will have to build off parity calculations.