XP 12K and Tibco Enterprise Messaging server on SAN

[manu101star]

I am planning to host Tibco Enterprise Messaging server ( on two nodes , without using any cluster software) on xp12k.I am planning to use the Fault tolerent capabilty of Tibco EMS ( i.e. failover from one istance to another ) for failover.Pls let me know if anybody has any experience /document on the same .There are many questions in my mind as of now Like Unique write ownership,distributed file locking , How will failover happen etc .Any help on the same will be great