We are running Symantec Veritas Cluster Server (VCS) 6.0 on three Windows 2008 Server R2 Enterprise servers and with MPIO feature turned off, it works fine. We can create FileShare resources and bring them online on any of the three cluster nodes.
Since we are using a SAN for shared storage and redundant connections, I turned on the MPIO feature that comes with W2K8. Once I do that, each node reboots itself (one at a time) and will continue to do so until I stop VCS on the nodes.
With VCS stopped, MPIO works fine and the servers do not reboot.
The servers BSOD with Stop 0xBADFFFFF but a search for that (even on MS support site) doesn't come up with anything useful.