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Re: XFS defragmentation issue

To: Dave Chinner <david@xxxxxxxxxxxxx>
Subject: Re: XFS defragmentation issue
From: John Lister <john.lister@xxxxxxxxxxxxx>
Date: Sat, 11 Sep 2010 09:25:18 +0100
Cc: xfs@xxxxxxxxxxx
In-reply-to: <20100911082330.GG705@dastard>
References: <4C8A4395.5070702@xxxxxxxxxxxxx> <4C8B27E4.2050102@xxxxxxxxxxxxx> <20100911082330.GG705@dastard>
User-agent: Mozilla/5.0 (Windows; U; Windows NT 6.0; en-GB; rv: Gecko/20100802 Thunderbird/3.1.2

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 and xfsprogs
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.



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