There are two different versions of the Xsan 1.1 software upgrades. One is available for 10.3.9 while the other is for 10.4. Upgrade instructions from Xsan 1.0 on 10.3.x to Xsan 1.1 on 10.3.9 are: Backup the Xsan completely Unmount the Xsan volumes Upgrade the Operating System on the Primary Metadata Controller. Upgrade the Operating System on the Backup Metadata Controller. Upgrade the Xsan Software on the Backup Metadata Controller. Upgrade the Xsan Software on the Backup Metadata Controller. If the system you want to be the Primary Metadata Controller is not currently controlling the volumes, return control to the intended Primary Metadata Controller Upgrade all client systems to 10.3.9…