What Is Fencing In Red Hat Cluster?

1.	What Is Fencing In Red Hat Cluster?
Answer» Fencing is the disconnection of a node from the cluster's SHARED storage. Fencing cuts off I/O from shared storage, thus ensuring DATA integrity. The cluster INFRASTRUCTURE PERFORMS fencing through the fence daemon, fenced. When CMAN DETERMINES that a node has failed, it communicates to other cluster-infrastructure components that the node has failed. fenced, when notified of the failure, fences the failed node.

Answer»

Fencing is the disconnection of a node from the cluster's SHARED storage.
Fencing cuts off I/O from shared storage, thus ensuring DATA integrity.
The cluster INFRASTRUCTURE PERFORMS fencing through the fence daemon, fenced.
When CMAN DETERMINES that a node has failed, it communicates to other cluster-infrastructure components that the node has failed.
fenced, when notified of the failure, fences the failed node.

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