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Re: XFS (sdd1): Internal error xfs_da_do_buf(2) at line 2097 of file /us

To: Dave Chinner <david@xxxxxxxxxxxxx>
Subject: Re: XFS (sdd1): Internal error xfs_da_do_buf(2) at line 2097 of file /usr/src/packages/BUILD/kernel-default-3.3.6/linux-3.3/fs/xfs/xfs_da_btree.c.
From: Richard Ems <richard.ems@xxxxxxxxxxxxxxxxx>
Date: Tue, 18 Sep 2012 10:31:11 +0200
Cc: xfs@xxxxxxxxxxx
In-reply-to: <20120917234926.GJ13691@dastard>
References: <50573A13.7000206@xxxxxxxxxxxxxxxxx> <20120917234926.GJ13691@dastard>
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:15.0) Gecko/20120825 Thunderbird/15.0
On 09/18/2012 01:49 AM, Dave Chinner wrote:
> On Mon, Sep 17, 2012 at 04:56:19PM +0200, Richard Ems wrote:
>> Hi all,
>>
>> saturday morning one hard disc on our RAID6 failed. About one hour later,
>>  the XFS running on that device reported the following error:
>>
>> XFS (sdd1): Internal error xfs_da_do_buf(2) at line 2097 of file 
>> /usr/src/packages/BUILD/kernel-default-3.3.6/linux-3.3/fs/xfs/xfs_da_btree.c.
> .....
>> Sep 15 07:30:51 fs1 kernel: [7369085.792619] XFS (sdd1): Corruption 
>> detected. Unmount and run xfs_repair
>>
>>
>> And this repeating again and again ...
>>
>> This system has been running fine for 87 days, no power outages or such.
>> It's connected to an UPS, and the H800 Raid Controller has a BBU installed.
> .....
>> Why could this have happened?
> 
> Something went wrong at the RAID level (i.e. your hardware) in
> handling the disk failure and recovering the array. It corrupted
> blocks in the volume rather than recovering them cleanly without
> errors. The corrupted blocks happened to be in a directory block,
> and a frequently accessed one according to the errors in the log.
> 
> What you found in lost+found was the recoverable fragments of the
> directory and whatever else was corrupted during the disk failure
> incident.
> 
>> What more info can I provide to understand this issue and avoid
>> this to happen again?
> 
> I'd be asking your hardware vendor about why it corrupted the
> volume on a single disk failure when it is supposed to be able to
> transparently handle double disk failures without losing/corrupting
> data.
> 
> Cheers,
> 
> Dave.
> 

Ok, many thanks Dave. I will forward this conversation to the DELL guys ...

Thanks again,
Richard


-- 
Richard Ems       mail: Richard.Ems@xxxxxxxxxxxxxxxxx

Cape Horn Engineering S.L.
C/ Dr. J.J. Dómine 1, 5º piso
46011 Valencia
Tel : +34 96 3242923 / Fax 924
http://www.cape-horn-eng.com

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