[mythtv-users] Defragging XFS File Systems

[Kenneth Emerson]

I hadn't given much thought to fragmentation of my recordings volume (XFS)
until reading through some other threads recently that mentioned how
fragmented and 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?  I am hoping
that there are other MythTV users using XFS that have some experience in
using the xfs tools.

Google didn't offer much help.

Regards,

Ken E.
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