Apple Xsan 1.4 - Manual (Page 30)

30 Chapter 1 Overview of Xsan
Security
As the SAN administrator, you can control access to shared volumes in several ways.
First, users cannot browse or mount SAN volumes. Only a SAN administrator can
specify which volumes are mounted on which client computers. One way you can
control access to data is to mount a volume only on appropriate client computers.
To prevent users from modifying data on a volume, you can mount the volume with
read-only access.
You can control user access to folders on a volume by setting up access control lists
(ACLs) in Workgroup Manager or by specifying owner, group, and general access
permissions in the Finder.
You can also set up zones in the underlying Fibre Channel network to segregate users
and volumes.
Expanding Storage
There are two ways you can add free space to an Xsan volume:
 Add Xserve RAID systems (new LUNs) to existing storage pools
 Add entire new storage pools to volumes
Both methods require you to unmount and remount the volume on clients.
You can also add new volumes to a SAN at any time.
For information about expanding Xsan storage, see “Adding Storage” on page 78.