linux-kernel - Re: csum errors

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Message-ID: <20100715190309.GI8623@think>
Date:	Thu, 15 Jul 2010 15:03:09 -0400
From:	Chris Mason <chris.mason@...cle.com>
To:	Johannes Hirte <johannes.hirte@....tu-ilmenau.de>
Cc:	linux-kernel@...r.kernel.org, linux-btrfs@...r.kernel.org
Subject: Re: csum errors

On Thu, Jul 15, 2010 at 08:30:17PM +0200, Johannes Hirte wrote:
> Am Dienstag 13 Juli 2010, 14:23:58 schrieb Johannes Hirte:
> > ino 1959333 off 898342912 csum 4271223884 private 4271223883
> 
> I think, this is a different error. I've only seen them on filesystems from my 
> Opteron system. It seems that the recorded csums are wrong and it looks to me 
> like rounding errors. The data itself should be correct, as I've tested one 
> affected file via md5sum against the original on another filesystem.
> Any ideas what is going wrong here?

Are you doing data mirroring?

We can map that block and do a raw read off the device to see what the
data blocks actually contain.

-chris
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