Apple Xsan 1.4 - Manual (Page 79)

Chapter 3 Managing SAN Storage 79
The third option creates a new volume that must be explicitly mounted on client
computers. Clients must then choose to save new files and folders on the new volume,
or copy existing items there, so this option is more likely to disrupt user workflow.
Restoring the Previous Volume Configuration After Changes
If you have trouble with a volume after expanding it, you can restore its previous
configuration so it can be used until you solve the problem. See “You’re Unable to
Restart a Volume After Adding LUNs or Storage Pools” on page 145.
About Rearranging Fibre Channel Connections
If, while expanding or reconfiguring your SAN, you break a Fibre Channel connection
between an Xsan client and a mounted volume for more than one minute, the volume
is unmounted from the client in a way that can cause problems with applications
running on the client and make the volume difficult to remount. To avoid this,
unmount the volume before you disconnect the client.
Important: If you need to disconnect a Fibre Channel cable for more than a minute,
you should first unmount all Xsan volumes from all controllers and clients on the SAN,
and then either shut down all computers connected to the SAN or disconnect all of
their Fibre Channel cables.