fence_apc is an I/O Fencing agent which can be used with the APC network power switch. It logs into device via telnet/ssh and reboots a specified outlet. Lengthy telnet/ssh connections should be avoided while a GFS cluster is running because the connection will block any necessary fencing actions.
http://www.apc.com
IP Address or Hostname
Login Name
Login password or passphrase
Force Python regex for command prompt
SSH connection
Physical plug number, name of virtual machine or UUID
Physical switch number on device
TCP/UDP port to use for connection with device
Forces agent to use IPv4 addresses only
Forces agent to use IPv6 addresses only
Script to retrieve password
Identity file for ssh
SSH options to use
Fencing Action
Verbose mode
Write debug information to given file
Display version information and exit
Display help and exit
Separator for CSV created by operation list
Test X seconds for status change after ON/OFF
Wait X seconds for cmd prompt after issuing command
Wait X seconds for cmd prompt after login
Wait X seconds after issuing ON/OFF
Wait X seconds before fencing is started
Count of attempts to retry power on