Fencing is a very important concept in computer clusters for HA (High Availability). Unfortunately, given that fencing does not offer a visible service to users, it is often neglected.
Fencing may be defined as a method to bring an HA cluster to a known state. But, what is a “cluster state” after all? To answer that question we have to see what is in the cluster.
via Fencing and Stonith.
STONITH (Shoot The Other Node In The Head)
Stonith is our fencing implementation. It provides the node level fencing.
Gotta love how they come up with those acronyms.