Currently Being ModeratedDec 20, 2012 9:40 PM (in response to ArTT Vandelay)
Since you don't have fibre channel hardware, you won't be able to enable Xsan in System Preferences. You will need to load the Xsan launch daemon manually.
launchctl load -w /System/Library/LaunchDaemons/com.apple.xsan.plist
You should then be able to get a volume set up in Xsan Admin. I would only do this for testing though. Apple only supports fibre channel storage with Xsan.