MSA20 RAID5 recovery failure due to URE on another disk

Posted by Andrey on Server Fault See other posts from Server Fault or by Andrey
Published on 2012-06-09T05:49:19Z Indexed on 2012/06/09 10:42 UTC
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recovery

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raid5

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failed

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msa

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ure

I have MSA20 with one disk array on 12 disks and 3 LUNs on it (each raid 5). A few days ago one disk in one of the LUNs was failed and I replaced it. But raid5 recovering failed at 13% and I see in ADU report that one of the disk has "Errors Logged = 5566" and according SCSI specifications it is URE (Sense Code=0x11, Qualifier=0x00). In serial log I also see URE error. It seems that Raid5 can't be rebuilt because of this. So I have a few questions:

Is there a way to recover raid5 still?
If I leave new disk that was replaced and remove disk with URE, will other LUNs be destroyed or just failed LUN? If all LUNs will fail what is the sense to make each LUN with own raid on one disk group array if 2 failed disk can destroy all?
As I understand the preferred way is to create one disk array for one LUN in future and not one array with few LUNs?

Thanks.

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