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Fencing is the process of locking resources away from a node whose status is uncertain.

There are a variety of fencing techniques available.

One can either fence nodes - using Node Fencing, or fence resources using Resource Fencing. Some types of resources are Self Fencing Resources, and some aren't damaged by simultaneous use, and don't require fencing at all.

See Also

Split Brain, Dunn's Law of Information, Node Fencing, Resource Fencing, Self Fencing Resource, STONITH, Split-brain, quorum, fencing overview

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