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Defragging XFS File Systems

To: xfs@xxxxxxxxxxx
Subject: Defragging XFS File Systems
From: Kenneth Emerson <kenneth.emerson@xxxxxxxxx>
Date: Mon, 6 Jun 2011 22:52:48 -0500
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I hadn't given much thought to fragmentation of my TV recordings volume (XFS) until reading through some MythTV-users threads recently that mentioned how fragmented an XFS file system could become.  After running xfs_db, I found out that my fs appeared to be quite bad:

$ sudo xfs_db -c frag -r /dev/mapper/appl_vg-appl_lv
 actual 1138668, ideal 11023, fragmentation factor 99.03%

I then ran xfs_fsr with all defaults (ran for two hours) and then re-ran xfs_db and got the following results:

$ sudo xfs_db -c frag -r /dev/mapper/appl_vg-appl_lv
invalid numrecs (27111) in bmapbtd block
invalid numrecs (4716) in bmapbtd block
invalid numrecs (58978) in bmapbtd block
actual 1034793, ideal 11024, fragmentation factor 98.93%

The fragmentation level was reduced, but I was concerned about the error messages.  Before I go any further, am I corrupting my file system with the defragging or are these "invalid numrecs" messages unimportant?

Google didn't offer much help.


Ken E.
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