Apple Xsan 1.1 - Manual (Page 68)

68 Chapter 3 Managing SAN Storage
Defragmenting a Volume
Defragmenting a file reassembles its pieces into the most efficient arrangement. You
can use the
snfsdefrag command to defragment a single file, a folder (directory of
files), or an entire volume.
To defragment a file, directory, or volume:
1 Open Terminal (in /Applications/Utilities).
2 If you are not working at the SAN controller computer, use SSH to log in to the
controller remotely:
$ ssh user@computer
where user is an administrator user on the controller computer and computer is the
controller’s name or IP address.
3 Run the snfsdefrag command (in /Library/Filesystems/Xsan/bin).
To defragment one or more individual files:
$ sudo snfsdefrag filename [filename ... ]
To defragment an entire directory:
$ sudo snfsdefrag -r directory
To defragment an entire volume, set directory to the root directory of the volume.
For more information see the snfsdefrag man page or “Defragmenting a File,
Directory, or Volume (snfsdefrag)” on page 117.
Checking the Integrity of a Volume
If SAN users are having trouble accessing files, you can use the cvfsck command to
check the integrity of a volume, its metadata, and files.
To check a volume:
1 Open Terminal (in /Applications/Utilities).
2 If you are not working at the SAN controller computer, use SSH to log in to the
controller remotely:
$ ssh user@computer
where
user
is an administrator user on the controller computer and
computer
is the
controller’s name or IP address.
3 Run the cvfsck command-line utility (in /Library/Filesystems/Xsan/bin) to check the
volume without making repairs:
$ sudo cvfsck -vn volume
where
volume
is the name of an Xsan volume. You’ll see a warning that the journal is
active; this is normal.
For more information on using this command, see the cvfsck man page.