Apple Xsan 1.4 - Manual (Page 177)

Appendix B Using the Command Line 177
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, Folder, 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 folder:
$ 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] [...]