Apple Xsan 1.4 - Manual (Page 101)

Chapter 3 Managing SAN Storage 101
Choosing the Windows ID Mapping Method
Use the Windows ID Mapping setting to specify how Windows clients map user and
group information to Xsan-compatible user IDs (UIDs) and group IDs (GIDs), which they
need in order to access Xsan volumes.
For more information, see “Mapping Windows User and Group IDs” on page 112.
Checking Volume Fragmentation
When you create a file, Xsan breaks the file into pieces and distributes these pieces
efficiently over the LUNs that make up one of the volume’s storage pools. Over time, as
the file is modified, its pieces can become scattered in less efficient arrangements. You
can use the cvfsck utility to check on the state of file fragmentation on your volumes.
To check volume fragmentation:
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/) with the -f
option:
$ sudo cvfsck -f volume
For more information, see the cvfsck man page.