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XFS defragmentation issue

To: xfs@xxxxxxxxxxx
Subject: XFS defragmentation issue
From: John Lister <john.lister@xxxxxxxxxxxxx>
Date: Fri, 10 Sep 2010 15:41:25 +0100
User-agent: Mozilla/5.0 (Windows; U; Windows NT 6.0; en-GB; rv:1.9.2.8) Gecko/20100802 Thunderbird/3.1.2
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?

Thanks

John

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