Fence Agents for Red Hat Cluster - Citrix XenServer 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_xenapi is an I/O Fencing agent used on Citrix XenServer hosts. It uses
 the XenAPI, supplied by Citrix, to establish an XML-RPC session to a XenServer
 host. Once the session is established, further XML-RPC commands are issued in
 order to switch on, switch off, restart and query the status of virtual
 machines running on the host.