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Areca raidset disappeared

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DarkT

Limp Gawd
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Oct 24, 2006
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The other day I was upgrading my Areca 1220 RAID 5 from 5 drives to 7. It was going well, until about 7% of the migration when one of the new drives failed. I shutdown my PC, removed the bad drive and rebooted, but now my raidset is gone.

I tried removing the other new drive, but no luck. I've e-mailed Areca tech support, but they haven't gotten back to me in a week. All the data is definitely still there and I believe the raidset information is actually stored on each drive of the array.

Anyone have any ideas on how to recover my raidset?
 
I don't think that's actually possible. Traditional RAID5/6 expansion will overwrite valid data on your existing disks, thus you actually need the newly added disk as this stores part of your data now. During the expansion process, the whole volume becomes degraded to RAID0.

Theoretically, the RAID engine could continue the expansion if it knew where it last was with the relocation-procedure. I'm not sure if the Areca controller allows this though. I fear your data is lost. You could still recover the part beyond 7% if that's where it stayed. But the recovery procedure will be painful, and certainly not 100%. Such recovery can be done under Linux or FreeBSD.
 
You can still lose a drive during expansion. I have and it wasn't a problem.
 
areca controllers maintain raid level during oce and rlm, you can stop or cancel the process at any time with no danger to your data.
Try doing 'rescue' command under RAIDSet Functions>Rescue RAIDset. Also, after the RAIDset is back, you also have to run "Signat" in order for your RAIDset to regenerate a new signature or else the RAIDset will be lost again on your next boot.
If that doesn't work u can try the 'secret' / unsupported command "Level2Rescue"
 
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