I/O fencing protects the data on shared disks when nodes in a cluster detect a change in the cluster membership that indicates a split-brain condition.
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 technology uses coordination points for arbitration in the event of a network partition.
More Information