XFS

get info

1
~# xfs_info /mnt/plop

check fragmentation

1
~# xfs_db -r -c 'frag' /dev/plop

defrag

1
~# xfs_fsr

repair

1
~# xfs_repair (-L) -m 20480 /dev/plop

( flush cache)

1
~# echo 1 > /proc/sys/vm/drop_caches
~# echo 2 > /proc/sys/vm/drop_caches