Apple Xsan 2 (Second Edition) - Manual (Page 11)

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Upgrading from Xsan 2 to Xsan 2.1
If your SAN is already running Xsan 2, follow these instruction to upgrade to Xsan 2.1.
Step 1: Update SAN computers to Mac OS X v10.5.3 or later
It is highly recommended that you update all SAN computers to Mac OS X 10.5.3 or
later before you install Xsan 2.1.
Important: To keep your SAN volumes available during the upgrade, upgrade your SAN
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. You can rely on
automatic controller failover or, if you want, control failover using the Force Failover
command in the Action (gear) pop-up menu on the Volumes pane of Xsan Admin
To upgrade Mac OS X:
m Run the Mac OS X v10.5.3 updater on each SAN computer.
If the computer is connected to the Internet, you can open the Software Update pane
of System Preferences, click Check Now, and install the Mac OS X (or Mac OS X Server)
v10.5.3 (or later) update.
If the computer is on a private network only, 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 SAN computer, and then run it.
Step 2: Update metadata controllers to Xsan 2.1
Update your metadata controllers to Xsan 2.1 before you update your clients.
Important: If you want your SAN volumes to be available 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 update controllers:
m Use Software Update on each computer to install the Xsan 2.1 update.
If the computer 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 SAN computer, and then run it.
Step 3: Update clients to Xsan 2.1
After the metadata controllers are updated to Xsan 2.1, you can update SAN clients.
To update clients:
m Use Software Update (or download and run the update) on each computer to install
the Xsan 2.1 update.