FENCE_AGENT - Online Linux Manual PageSection : 8
Updated : 2009-10-20
Source : fence_mpath (Fence Agent)
NAMEfence_mpath - Fence agent for multipath persistent reservation
DESCRIPTIONfence_mpath is an I/O fencing agent that uses SCSI-3 persistent reservations to control access multipath devices. Underlying devices must support SCSI-3 persistent reservations (SPC-3 or greater) as well as the "preempt-and-abort" subcommand. The fence_mpath agent works by having an unique key for each pair of node and device that has to be set also in /etc/multipath.conf. Once registered, a single node will become the reservation holder by creating a "write exclusive, registrants only" reservation on the device(s). The result is that only registered nodes may write to the device(s). When a node failure occurs, the fence_mpath agent will remove the key belonging to the failed node from the device(s). The failed node will no longer be able to write to the device(s). A manual reboot is required. fence_mpath accepts options on the command line as well as from stdin. Fenced sends parameters through stdin when it execs the agent. fence_mpath can be run by itself with command line options. This is useful for testing and for turning outlets on or off from scripts. Vendor URL: https://www.sourceware.org/dm/
PARAMETERS -o, --action=[action] Fencing Action (Default Value: off) -d, --devices=[devices] List of devices to use for current operation. Devices can be comma-separated list of device-mapper multipath devices (eg. /dev/dm-3). Each device must support SCSI-3 persistent reservations. -k, --key=[key] Key to use for the current operation. This key should be unique to a node and have to be written in /etc/multipath.conf. For the "on" action, the key specifies the key use to register the local node. For the "off" action, this key specifies the key to be removed from the device(s). This parameter is always required. -v, --verbose Verbose mode -D, --debug-file=[debugfile] Write debug information to given file -V, --version Display version information and exit -h, --help Display help and exit --delay=[seconds] Wait X seconds before fencing is started (Default Value: 0) --login-timeout=[seconds] Wait X seconds for cmd prompt after login (Default Value: 5) --mpathpersist-path=[path] Path to mpathpersist binary (Default Value: /sbin/mpathpersist) --power-timeout=[seconds] Test X seconds for status change after ON/OFF (Default Value: 20) --power-wait=[seconds] Wait X seconds after issuing ON/OFF (Default Value: 0) --shell-timeout=[seconds] Wait X seconds for cmd prompt after issuing command (Default Value: 3) --store-path=[path] Path to directory where fence agent can store information (Default Value: /var/run/cluster) --retry-on=[attempts] Count of attempts to retry power on (Default Value: 1) --use-sudo Use sudo (without password) when calling 3rd party sotfware. --sudo-path=[path] Path to sudo binary (Default Value: /usr/bin/sudo)
ACTIONS on Power on machine. off Power off machine. status This returns the status of the plug/virtual machine. list List available plugs with aliases/virtual machines if there is support for more then one device. Returns N/A otherwise. list-status List available plugs with aliases/virtual machines and their power state if it can be obtained without additional commands. monitor Check the health of fence device metadata Display the XML metadata describing this resource.
STDIN PARAMETERS action Fencing Action (Default Value: off) devices List of devices to use for current operation. Devices can be comma-separated list of device-mapper multipath devices (eg. /dev/dm-3). Each device must support SCSI-3 persistent reservations. key Key to use for the current operation. This key should be unique to a node and have to be written in /etc/multipath.conf. For the "on" action, the key specifies the key use to register the local node. For the "off" action, this key specifies the key to be removed from the device(s). This parameter is always required. verbose Verbose mode debug Write debug information to given file version Display version information and exit help Display help and exit delay Wait X seconds before fencing is started (Default Value: 0) login_timeout Wait X seconds for cmd prompt after login (Default Value: 5) mpathpersist_path Path to mpathpersist binary (Default Value: /sbin/mpathpersist) power_timeout Test X seconds for status change after ON/OFF (Default Value: 20) power_wait Wait X seconds after issuing ON/OFF (Default Value: 0) shell_timeout Wait X seconds for cmd prompt after issuing command (Default Value: 3) store_path Path to directory where fence agent can store information (Default Value: /var/run/cluster) retry_on Count of attempts to retry power on (Default Value: 1) sudo Use sudo (without password) when calling 3rd party sotfware. sudo_path Path to sudo binary (Default Value: /usr/bin/sudo) 0
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