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Re: XFS defragmentation issue

To: xfs@xxxxxxxxxxx
Subject: Re: XFS defragmentation issue
From: Stan Hoeppner <stan@xxxxxxxxxxxxxxxxx>
Date: Fri, 10 Sep 2010 14:00:51 -0500
In-reply-to: <4C8A4395.5070702@xxxxxxxxxxxxx>
References: <4C8A4395.5070702@xxxxxxxxxxxxx>
User-agent: Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.9.2.9) Gecko/20100825 Thunderbird/3.1.3
John Lister put forth on 9/10/2010 9:41 AM:
>  Hi, using ubuntu 9.04, kernel version 2.6.28-18 and xfsprog v2.10.2-1
> I'm trying to defragment a drive. If I use xfs_db to check for
> fragmentation it shows for example that a file has 20k+ fragments:
> inode 578505506 actual 23240 ideal 1
> 
> mapping the inode to the file and running xfs_frs states that the file
> is fully defragmented.
> 
> Also running xfs_frs says the drive is defragmented while xfs_db for
> example reports 300k fragments.
> 
> Which is right? and is it possible to defragment the file assuming it is
> fragmented so badly, if so how?

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.

-- 
Stan

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