Apple Xsan (upgrading to Xsan 1.4) - Manual (Page 15)

Chapter 2 Upgrading to Xsan 1.4 on Mac OS X version 10.4 15
Step 4: Upgrade controllers to Xsan 1.4
When all controllers are running Xsan 1.3 on Mac OS X v10.4.7, you can upgrade the
Xsan software to Xsan 1.4.
Important: If you want your SAN volumes to be available to clients during the upgrade,
upgrade the controllers one at a time so that there is always a standby controller to
assume control of any volume currently hosted by the controller you are upgrading.
To upgrade Xsan on the controllers:
1 Upgrade one controller to Xsan 1.4.
If you have an Xsan 1.4 installation disc, insert it in the computer and double-click the
installation package Install Xsan.mpkg.
If you don’t have the disc but the computer is connected to the Internet, you can open
the Software Update pane of System Preferences, click Check Now, select the Xsan
version 1.4 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 when prompted by the installer.
Any volume currently hosted by the controller fails over to a standby controller.
3 Repeat steps 1 and 2 above for each additional controller on your SAN.