Apple Xsan 2 - Manual (Page 86)

Defragment a file, folder, or volume:
1 Open Terminal (in the /Applications/Utilities/ folder) on any SAN computer.
If you aren’t working at a SAN computer, use SSH to log in to a SAN computer remotely:
$ ssh user@computer
Replace user with the name of an administrator user on the SAN computer and
computer with the SAN computer’s name or IP address.
If you have trouble making an SSH connection, check the Sharing pane of System
Preferences on the SAN computer to make sure Remote Login service is turned on.
2 Run the snfsdefrag command-line tool.
To defragment individual files:
$ sudo snfsdefrag -v filename [filename ... ]
To defragment a folder:
$ sudo snfsdefrag -vr folder
To defragment a volume, set folder to the volume name.
For more information, see the snfsdefrag man page or “Defragment a file, folder, or
volume (snfsdefrag)” on page 154.
Check the integrity of a volume
If SAN users have trouble accessing files, use the cvfsck command-line tool to check
the integrity of a volume, its metadata, and its files.
Check a volume:
1 Open Terminal (in the /Applications/Utilities/ folder).
2 If you aren’t working at the SAN controller computer, use SSH to log in to the controller
remotely:
$ ssh user@computer
Replace user with the name of an administrator user on the controller computer and
computer with the controller’s name or IP address.
If you have trouble making an SSH connection, check the Sharing pane of System
Preferences on the controller to make sure Remote Login service is turned on.
3 Run the cvfsck command-line tool (in /System/Library/Filesystems/acfs.fs/Contents/
bin/) to check the volume without making repairs:
$ sudo cvfsck -vn volume
You’ll see a warning that the journal is active; this is normal.
For more information, see the cvfsck man page.
86 Chapter 5 Manage SAN storage