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.
The fencing operation determines the following:
The nodes that must retain access to the shared storage
The nodes that must be ejected from the cluster
This decision prevents possible data corruption. The installer installs the I/O fencing driver, VRTSvxfen, when you install SFCFSHA. To protect data on shared disks, you must configure I/O fencing after you install and configure SFCFSHA.
I/O fencing technology uses coordination points for arbitration in the event of a network partition.
I/O fencing coordination points can be coordinator disks or coordination point servers (CP servers) or both. You can configure disk-based or server-based I/O fencing:
See About planning to configure I/O fencing.
Note: |
Symantec recommends that you use I/O fencing to protect your cluster against split-brain situations. |
See the Veritas Storage Foundation Cluster File System High Availability Administrator's Guide.