[SATLUG] First question - RAID5 quit working

Samuel Leon satlug at net153.net
Sun Aug 16 17:14:23 CDT 2009


Don Wright wrote:
> 
> 
> Actually, having parts from the same batch fail simultaneously is a
> rather frequent problem in RAID. It could also be a common event like a
> power glitch that damaged components on both drives and was just barely
> under the threshold to kill them all.
> 
> Unlike everyone else so far, I'm going to tell you to run diagnostics on
> all the drives before you destroy the data on the array by forcing it to
> build. Start with smartctl from smartmontools. It should be readily
> available in Ubuntu. Use the short selftest to get an idea how *all* the
> drives are working - it's non-destructive and only takes a couple of
> minutes.
> http://smartmontools.sourceforge.net/
> 
> Then check the two drives that aren't getting along with mdadm using the
> long test. This takes a few hours but you can do both at the same time.
> If this passes you can be fairly certain the drives will function once
> rebuilt into the array.
> 
> Now switch to the RAID tools and check the individual drives. I'll cover
> that in the next message.  --Don
> 


Good point.
Sam


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