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:

quoted

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.

quoted

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.

quoted

Justin.

Cheers,

Andrew