Fencing is a safety mechanism used in clustered systems to isolate a failed or unresponsive node so it cannot corrupt shared resources such as storage, databases, or virtual machines.
In high-availability (HA) clusters, a node may lose communication with the rest of the cluster but continue running. This can lead to a split-brain situation where two nodes believe they own the same resource. Fencing prevents this by forcibly removing the problematic node from service.
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