There are times with Xsan when the admin utility sits unresponsive (the pinwheel at the bottom of the screen spins annoyingly to no end).  When the Admin tool gets unresponsive you are typically staring down the barrel of some kind of naming issue.  In these cases I almost universally have DNS administrators tell me that everything is fine without first bothering to actually look at the records for the hosts on the SAN.  The easy way to verify this hypothesis is to build a custom hosts file (/etc/hosts).  This bypasses the DNS resolver and if everything loads up correctly then you do indeed have a DNS/host naming issue.