Apple Xsan 1.1 - Manual (Page 117)

Appendix B Using the Command Line 117
Starting a Port Mapper Process (fsmpm)
You can use the fsmpm command to start a file system port mapper process on a client
or controller.
$ fsmpm
For more information, see the
fsmpm
man page.
Defragmenting a File, Directory, or Volume (snfsdefrag)
You can use the snfsdefrag command to defragment a file by reallocating its data in a
single extent. This can improve read and write performance for a file by increasing disk
efficiency and reducing file metadata management overhead.
To defragment a file or directory:
$ snfsdefrag [-D] [-d] [-q] [-s] [-v] [-G group] [-K affinity] [-k affinity]
[-m count] [-r] target
To report file extents without defragmenting:
$ snfsdefrag -e [-G group] [-K affinity] [-r] target [target] [...]
To display an extent count without defragmenting:
$ snfsdefrag -c [-G group] [-K affinity] [-r] target [target] [...]
To prune a file (remove allocated extents beyond the end of file):
$ snfsdefrag -p [-D] [-v] [-q] [-G group] [-K affinity] [-m count] [-r]
target [target] [...]
To list files that are candidates for defragmentation:
$ snfsdefrag -l [-D] [-v] [-G group] [-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.