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07-01-2015 02:04 PM
07-01-2015 02:04 PM
Replacing two corrupted drives in a RAID 50 on MSA 2012sa
Hello all,
I need help determining the course of action to restore my MSA functionality (12 drives in a RAID 50 with 1 vdisk on a MSA 2012sa).
Slot 4 had an amber light and showed as missing in the vdisk overview, so I changed it.
However, the MSA experienced a hard drive failure (slot 2) during the reconstruction of the new drive (slot 4).
As a result the two drives (the one that failed and the one reconstructing) had amber lights, and the vdisk was "offline".
I cleared the metadata on those two drives (their status went from "L" to "A") to get the vdisk to "quarantine". Afterwards, I couldn't dequarantine it (returns "request failed "1" " when I try to dequrantine.)
I removed both slots 2&4 to install the old drive from slot 4 (which was malfunctioning) => the vdisk dequarantined and went to "critical". The vdisk is back online but the server can't access some of the folders and tells me the data is corrupted.
I dont understand why reinstalling the old drive helped the vdisk go back to "critical" and why the LED lights for that slot is now green !
It makes me worry that maybe the issue doesnt come from the drive but from somewhere else. The other LED indicators and SMU indicators are green for controller and enclosure status.
I ordered two new drives to replace slot 2&4.
- What is the procedure for changing two drives at once? (while minimizing data loss)
- Should I be looking at non-hard drive related issues?
- Can I "format" a drive before adding it to vdisk spares? (I'd like to do that so I can re-use the new drive that was affected during this incident since the drive should be fine from a hardware point of view.)
Thank you very much, and please let me know if I need to complete my description.
Xavier
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07-02-2015 01:06 AM
07-02-2015 01:06 AM
Re: Replacing two corrupted drives in a RAID 50 on MSA 2012sa
>What is the procedure for changing two drives at once? (while minimizing data loss)
If you lose two drives in RAID 5, it's time to get out your backups.
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07-02-2015 01:30 PM
07-02-2015 01:30 PM
Re: Replacing two corrupted drives in a RAID 50 on MSA 2012sa
Okay, I will replace them for sure since I dont have a choice. I couldn't find whether there is a special procedure, maybe there isn't tho.
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07-03-2015 02:11 PM
07-03-2015 02:11 PM
Re: Replacing two corrupted drives in a RAID 50 on MSA 2012sa
Just to bring some closure to this. The drive had not totally failed which is why the vdisk was up when I had the drive plugged in.
I tried a new reconstruction, which failed again before finishing because the same drive failed again.
After removing the failling drive, I was left with 10 good drives, one functioning drive but only partially reconstructed, I cleared the cache on the partially reconstructed drive and I was able to recover the critical mode.
While waiting for the new drives to arrive, I ran chkdisk and checked the directory and found that a lot of the data was not lost (probably thanks to the fact this is a RAID 50).
Then it was just a matter of replacing the second drive which I did and the system reconstructed just fine.