About I/O fencing


About I/O fencing
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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.

See the Veritas Cluster Server User's Guide.

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 installvcs program installs the VCS I/O fencing driver, VRTSvxfen. To protect data on shared disks, you must configure I/O fencing after you install and configure VCS.

I/O fencing technology uses coordination points for arbitration in the event of a network partition.

Note:

Symantec recommends that you use I/O fencing to protect your cluster against split-brain situations.

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