[SATLUG] 1st question - RAID5 quit - Short tests completed

David Labens adlabens at swbell.net
Mon Aug 17 11:19:57 CDT 2009

Sam, Thanks for the response.  I can't do anything with it until I get home this evening anyway, so waiting is a requirement regardless of anyone's response!
I can order a new 250 gb HDD & probably have it here by the weekend - probably a little cheaper now, too ;+)
Ok, I now return to my regularly scheduled workload!

David Labens
San Antonio, TX

--- On Mon, 8/17/09, Samuel Leon <satlug at net153.net> wrote:

From: Samuel Leon <satlug at net153.net>
Subject: Re: [SATLUG] 1st question - RAID5 quit - Short tests completed
To: "The San Antonio Linux User's Group Mailing List" <satlug at satlug.org>
Date: Monday, August 17, 2009, 8:55 AM

David Labens wrote:
> SDA = # 1  Short offline       Completed without error       00%      5841         -
> SDB = # 1  Short offline       Completed without error       00%      5828         -
> SDC = # 1  Short offline       Completed: read failure       90%      5829         166       89727
> SDE = # 1  Short offline       Completed without error       00%      5824         -
> So, this means SDC failed?  Physical problems?  
> But, I should still be able to get the other 3 to mount & have the RAID5 repair itself, right?

True but the problem is that one of those drives could have been knocked out of the array many months ago.  The only reason you noticed was that another drive failed recently and caused filesystem issues.  So you really can't force the array to rebuild with 3 out of 4 disks if one of those disks contains very old data.  See how raid5 works here, specifically the xor summing: http://www.scottklarr.com/topic/23/how-raid-5-really-works/

Since we now know that sdc is in trouble, you might be able to get a replacement drive and try to copy the data over block by block.  And then use that drive in the array.  More than likely forcing the array to rebuild with this bad drive in it will cause problems.  So we don't want to do that yet.  I guess we will wait and see what Don has to say about the matter :)

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