The fencing operation determines the following:
This decision prevents possible data corruption. The installer installs the I/O fencing driver, VRTSvxfen, when you install Storage Foundation Cluster File System HA. To protect data on shared disks, you must configure I/O fencing after you install and configure Storage Foundation Cluster File System HA.
I/O fencing that uses coordinator disks is referred to as disk-based I/O fencing.
Disk-based I/O fencing ensures data integrity in a single cluster.
Coordination point server (CP server)
I/O fencing that uses at least one CP server system is referred to as server-based I/O fencing.
Server-based I/O fencing ensures data integrity in multiple clusters.
In virtualized environments that do not support SCSI-3 PR, Storage Foundation Cluster File System HA supports non-SCSI3 server-based I/O fencing.