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Message-ID: <4C8B3CEE.6070909@kickstone.com>
Date: Sat, 11 Sep 2010 09:25:18 +0100
From: John Lister <john.lister@kickstone.com>
MIME-Version: 1.0
Subject: Re: XFS defragmentation issue
References: <4C8A4395.5070702@kickstone.com> <4C8B27E4.2050102@kickstone.com>
	<20100911082330.GG705@dastard>
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To: Dave Chinner <david@fromorbit.com>
Cc: xfs@oss.sgi.com


On 11/09/2010 09:23, Dave Chinner wrote:
> On Sat, Sep 11, 2010 at 07:55:32AM +0100, John Lister wrote:
>>   Stan Hoeppner wrote on 9/10/2010 14:00
>>>> On 10/09/2010 15:41, John Lister wrote:
>>> Try unmounting and remounting the filesystem, and see if the various
>>> tools all report the same thing afterwards. This solved the exact same
>>> problem for me very recently, though I'm on kernel 2.6.34.1 and xfsprogs
>>> 2.9.8.
>> Cheers, that got rid of most of it, there is still a slight
>> discrepency  (50 extra fragments) which I can live with.
> xfs_db used buffered IO on the block device, which is not coherent
> with the filesystem. If you are using it on an active filesystem,
> then running "echo 1>  /proc/sys/vm/drop_caches" before you run
> xfs_db should make it read from disk at least once....
Ah, that makes more sense, I'll give it a go.

Thanks

John

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