What does cat /sys/block/md0/md/mismatch_cnt say?
That fragmentation looks normal/fine.
Justin.
On Wed, 3 Oct 2007, Andrew Clayton wrote:
On Wed, 3 Oct 2007 12:43:24 -0400 (EDT), Justin Piszcz wrote:
Have you checked fragmentation?
You know, that never even occurred to me. I've gotten into the mind set
that it's generally not a problem under Linux.
xfs_db -c frag -f /dev/md3
What does this report?
# xfs_db -c frag -f /dev/md0
actual 1828276, ideal 1708782, fragmentation factor 6.54%
Good or bad?
Seeing as this filesystem will be three years old in December, that
doesn't seem overly bad.
I'm currently looking to things like
http://lwn.net/Articles/249450/ and
http://lwn.net/Articles/242559/
for potential help, fortunately it seems I won't have too long to wait.
Justin.
Cheers,
Andrew
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