Apple Xsan 1.0 - Manual (Page 94)

94 Appendix B Using the Command Line
Examples
Count the extents in file datafile :
$ snfsdefrag -c datafile
List the extents:
$ snfsdefrag -e datafile
Defragment the file datafile :
$ snfsdefrag datafile
Defragment the file datafile only if it has more than two extents:
$ snfsdefrag -m 2 datafile
Defragment every file in the directory /datafolder (or any directory within
/datafolder ) that has more than one extent:
$ snfsdefrag -r datafolder
Recover unused pre-allocated disk space assigned to every file in directory
/datafolder :
$ snfsdefrag -rp datafolder
-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 directories within
the specified target directory.
-s Allocate new extents on block boundaries.
-v Display all available information and status during
defragmentation.
Parameter Description
LL0192.book Page 94 Thursday, July 29, 2004 5:20 PM