linux-ext4 - Re: Recovering a damaged ext4 fs

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Date:	Thu, 05 Feb 2009 22:02:05 -0600
From:	Eric Sandeen <sandeen@...hat.com>
To:	"J.D. Bakker" <jdb@...tmaker.nl>
CC:	linux-ext4@...r.kernel.org
Subject: Re: Recovering a damaged ext4 fs - revisited.

J.D. Bakker wrote:
> Hi,
> 
> My 4TB ext4 RAID-6 has just become damaged for the second time in two 
> months. While I do have backups for most of my data, it would be good 
> to know if there is a recovery procedure or a way to avoid these 
> crashes. The symptoms are massive group descriptor corruption, 
> similar to what was mentioned in 
> http://thread.gmane.org/gmane.comp.file-systems.ext4/10844 and 
> http://article.gmane.org/gmane.comp.file-systems.ext4/11195 .

.... snip ....

>    Error writing block 1 (Attempt to write block from filesystem 
> resulted in short write).  Ignore error? no
>    Error writing block 2 (Attempt to write block from filesystem 
> resulted in short write).  Ignore error? no
>    Error writing block 3 (Attempt to write block from filesystem 
> resulted in short write).  Ignore error? no
>    [...]
>    Error writing block 231 (Attempt to write block from filesystem 
> resulted in short write).  Ignore error? no
>    Error writing block 232 (Attempt to write block from filesystem 
> resulted in short write).  Ignore error? no
> 
> (full log at http://lartmaker.nl/ext4/e2fsck-md0.txt)

Those seem a bit odd; why are these write failing?  Anything in the
kernel logs when this happens?  I'm just wondering if there could be
some underlying storage problem?

Thanks,
-Eric
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