To fail over an application from one virtual machine to another, it is mandatory to store the application data on storage shared between the two virtual machines. In an RHEV environment, Veritas has tested application failovers with the application data residing on:
Dynamic Multipathing (DMP) as a node to virtual machines
Cluster Volume Manager (CVM) as a device to virtual machines
Cluster File System (CFS) as a device to virtual machines
iSCSI LUNs directly attached to the virtual machine
NFS exported directory mounted inside virtual machine
Fibre Channel-based LUNs