Symantec makes the following recommendations to ensure application availability and data integrity when a node loses connectivity to shared storage:
Do not set the failover attribute for the FC driver to 0.
However, if you do set the failover attribute to 0, set the FaultOnMonitorTimeouts value for the DiskGroup resource type to a finite value.
If you use I/O fencing, set the PanicSystemOnDGLoss attribute for the DiskGroup resource to 1. This ensures that the system panics when it loses connectivity to shared storage, and causes applications to fail over to another node. The failover ensures application availability, while I/O fencing ensures data integrity.