Here is the article on Symantec site. I can agree that installing TIBCO Enterprise Message Service (EMS) on Veritas Storage Foundation Cluster File System (CFS) is the best high availability and high performance solution. If your company really need 99.999% uptime, 50000 messages per second and ready to pay much for that.
Whenever we need to choose the most suitable solution, we must consider the various options. For example, if the SLA is required to ensure very high uptime, but not expected tens of thousands of messages per second, you can consider EMS options using NFS or HA Database for messages store. In the opposite case can be encouraged to use the failover cluster with shared cluster disk.