Apple Xsan (upgrading to Xsan 1.4) - Manual (Page 21)

Appendix Upgrading to Xsan 1.1 on Mac OS X version 10.4 21
Step 1: Unmount volumes from all controllers
To avoid difficulties mounting volumes on controllers after upgrading, unmount Xsan
volumes from the controllers before you upgrade.
Unmounting volumes from the controllers does not affect availability for clients.
To unmount a volume:
m In Xsan Admin, select the volume in the SAN Components list and click Clients.
Then select a controller and click Unmount.
Step 2: Upgrade all controllers to Mac OS X v10.3.9
Because Xsan 1.0 controllers can’t switch control of volumes directly to Xsan 1.1
controllers that are running Mac OS X v10.4, you must first upgrade your controllers to
Xsan 1.1 on Mac OS X v10.3.9 so that failover can take place and your volumes will be
available during the upgrade.
If your volumes don’t need to be available during the upgrade, you don’t have to
ensure failover compatibility and can skip to “Upgrade standby controllers to Xsan 1.1
on Mac OS X v10.4.7 or later” on page 23.
Important: If you want your SAN volumes to be available to clients during the upgrade,
upgrade your controllers one at a time so there is always a standby controller ready to
take control of any volume currently hosted by the controller you are upgrading.
To upgrade your controllers to Mac OS X v10.3.9:
1 Run the update installer on a controller computer.
If the computer is connected to the Internet, you can open the Software Update pane
of System Preferences, click Check Now, select the Mac OS X Combined version 10.3.9
update, and click Install.
If the controller is on a private network, you can use a computer that is connected to
the Internet to download the update from www.apple.com/support/downloads/,
transfer the installer to the controller computer, and run it.
2 Restart the controller computer when prompted.
3 Repeat steps 1 and 2 above for each controller on your SAN.