Fence Agents for Red Hat Cluster - manual ack agent

 Red Hat Fence Agents is a collection of scripts to handle remote power
 management for several devices. They allow failed or unreachable nodes to be
 forcibly restarted and removed from the cluster.
 .
 fence_ack_manual tells fenced to stop retrying and consider the node fenced.
 .
 It is important that this only be done after the node has been manually turned
 off or prevented from writing to shared storage. Without this manual action
 and verification, the storage that fencing protects may become corrupted.