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_rsa is an I/O Fencing agent which can be used with the IBM RSA II management interface. It logs into an RSA II device via telnet and reboots the associated machine. Lengthy telnet connections to the RSA II device should be avoided while a GFS cluster is running because the connection will block any necessary fencing actions.