Apple Xsan 2 (Third Edition) - Manual (Page 120)

120 Appendix B Using the Command Line
To display an extent count without defragmenting:
$ snfsdefrag -c [-K affinity] [-r] target [target] [...]
To prune a file (remove allocated extents beyond the end of file):
$ snfsdefrag -p [-D] [-v] [-q] [-K affinity] [-m count] [-r] target
[target] [...]
To list files that are candidates for defragmentation:
$ snfsdefrag -l [-D] [-v] [-K affinity] [-m count] [-r]
target
[target] [...]
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