Apple Xsan 2 - Manual (Page 155)

Appendix C Use command-line tools 155
Parameter Description
-c Display an extent count but don’t defragment
target.
-D Display debugging messages.
-d Operate on files with other than the current depth.
-e Report extents without defragmenting.
-K affinity Only operate on files with the specified storage
pool affinity.
affinity – the affinity key (in Xsan, the affinity
key is the same as the name of the storage pool)
You can use the
cvadmin show long
command to see a storage pool’s affinity key.
-k affinity Allocate new extents on the storage pool with
this affinity.
-l List files that might benefit from defragmentation.
-m count Only operate on files with more than count
extents.
-p Prune instead of defragment.
-q Suppress messages.
-r [target] Operate recursively to defragment all files in all
folders within the specified target folder.
-s Allocate new extents on block boundaries.
-v Display all available information and status
during defragmentation.
Examples
Count the extents in the file datafile:
$ snfsdefrag -c datafile
List the extents:
$ snfsdefrag -e datafile
Defragment the file datafile:
$ snfsdefrag datafile
Defragment every file in the folder /datafolder/ (or any folder within /datafolder/) that
has more than one extent:
$ snfsdefrag -r datafolder
Recover unused preallocated disk space assigned to every file in folder /datafolder/:
$ snfsdefrag -rp datafolder