fence_scsi (8) - Linux Manuals

fence_scsi: Fence agent for SCSI persistent reservation

NAME

fence_scsi - Fence agent for SCSI persistent reservation

DESCRIPTION

fence_scsi is an I/O fencing agent that uses SCSI-3 persistent reservations to control access to shared storage devices. These devices must support SCSI-3 persistent reservations (SPC-3 or greater) as well as the "preempt-and-abort" subcommand. The fence_scsi agent works by having each node in the cluster register a unique key with the SCSI device(s). 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_scsi 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_scsi accepts options on the command line as well as from stdin. Fenced sends parameters through stdin when it execs the agent. fence_scsi 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:

PARAMETERS

        

-a, --aptpl
Use the APTPL flag for registrations. This option is only used for the 'on' action.         
-n, --nodename=[nodename]
Name of the node to be fenced. The node name is used to generate the key value used for the current operation. This option will be ignored when used with the -k option.         
-o, --action=[action]
Fencing Action (Default Value: off)         
-k, --key=[key]
Key to use for the current operation. This key should be unique to a node. 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).         
-d, --devices=[devices]
List of devices to use for current operation. Devices can be comma-separated list of raw devices (eg. /dev/sdc). Each device must support SCSI-3 persistent reservations.         
-a, --logfile
Log output (stdout and stderr) to file         
-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         
--vgs-path=[path]
Path to vgs binary (Default Value: /usr/sbin/vgs)         
--power-wait=[seconds]
Wait X seconds after issuing ON/OFF (Default Value: 0)         
--login-timeout=[seconds]
Wait X seconds for cmd prompt after login (Default Value: 5)         
--power-timeout=[seconds]
Test X seconds for status change after ON/OFF (Default Value: 20)         
--delay=[seconds]
Wait X seconds before fencing is started (Default Value: 0)         
--sg_persist-path=[path]
Path to sg_persist binary (Default Value: /usr/bin/sg_persist)         
--shell-timeout=[seconds]
Wait X seconds for cmd prompt after issuing command (Default Value: 3)         
--sg_turs-path=[path]
Path to sg_turs binary (Default Value: /usr/bin/sg_turs)         
--corosync-cmap-path=[path]
Path to corosync-cmapctl binary (Default Value: /usr/sbin/corosync-cmapctl)         
--retry-on=[attempts]
Count of attempts to retry power on (Default Value: 1)

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

        

aptpl
Use the APTPL flag for registrations. This option is only used for the 'on' action.         
nodename
Name of the node to be fenced. The node name is used to generate the key value used for the current operation. This option will be ignored when used with the -k option.         
action
Fencing Action (Default Value: off)         
key
Key to use for the current operation. This key should be unique to a node. 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).         
devices
List of devices to use for current operation. Devices can be comma-separated list of raw devices (eg. /dev/sdc). Each device must support SCSI-3 persistent reservations.         
logfile
Log output (stdout and stderr) to file         
verbose
Verbose mode         
debug
Write debug information to given file         
version
Display version information and exit         
help
Display help and exit         
vgs_path
Path to vgs binary (Default Value: /usr/sbin/vgs)         
power_wait
Wait X seconds after issuing ON/OFF (Default Value: 0)         
login_timeout
Wait X seconds for cmd prompt after login (Default Value: 5)         
power_timeout
Test X seconds for status change after ON/OFF (Default Value: 20)         
delay
Wait X seconds before fencing is started (Default Value: 0)         
sg_persist_path
Path to sg_persist binary (Default Value: /usr/bin/sg_persist)         
shell_timeout
Wait X seconds for cmd prompt after issuing command (Default Value: 3)         
sg_turs_path
Path to sg_turs binary (Default Value: /usr/bin/sg_turs)         
corosync-cmap_path
Path to corosync-cmapctl binary (Default Value: /usr/sbin/corosync-cmapctl)         
retry_on
Count of attempts to retry power on (Default Value: 1)

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