fence_kdump(8) [centos man page]

fence_kdump(8)						      System Manager's Manual						    fence_kdump(8)

NAME

       fence_kdump - fencing agent for use with kdump crash recovery service

SYNOPSIS

       fence_kdump [OPTIONS]...

DESCRIPTION

       fence_kdump is an I/O fencing agent to be used with the kdump crash recovery service. When the fence_kdump agent is invoked, it will listen
       for a message from the failed node that acknowledges that the failed node it executing the kdump crash kernel.  Note  that  fence_kdump	is
       not  a  replacement for traditional fencing methods. The fence_kdump agent can only detect that a node has entered the kdump crash recovery
       service. This allows the kdump crash recovery service complete without being preempted by traditional power fencing methods.

OPTIONS

       -n, --nodename=NODE
	      Name or IP address of node to be fenced. This option is required for the "off" action. (default: none)

       -p, --ipport=PORT
	      IP port number that the fence_kdump agent will use to listen for messages. (default: 7410)

       -f, --family=FAMILY
	      IP network family. Force the fence_kdump agent to use a specific family. The value for FAMILY can  be  "auto",  "ipv4",  or  "ipv6".
	      (default: auto)

       -o, --action=ACTION
	      Fencing action to perform. The value for ACTION can be either "off" or "metadata". (default: off)

       -t, --timeout=TIMEOUT
	      Numer  of  seconds  to  wait  for  message from failed node. If no message is received within TIMEOUT seconds, the fence_kdump agent
	      returns failure. (default: 60)

       -v, --verbose
	      Print verbose output.

       -V, --version
	      Print version and exit.

       -h, --help
	      Print usage and exit.

STDIN PARAMETERS

       These parameters are passed to fence_kdump via standard input if no command-line options are present.

       nodename=NODE
	      Name or IP address of node to be fenced. This option is required for the "off" action. (default: none)

       ipport=PORT
	      IP port number that the fence_kdump agent will use to listen for messages. (default: 7410)

       action=ACTION
	      Fencing action to perform. The value for ACTION can be either "off" or "metadata". (default: off)

       timeout=TIMEOUT
	      Numer of seconds to wait for message from failed node. If no message is received	within	TIMEOUT  seconds,  the	fence_kdump  agent
	      returns failure. (default: 60)

ACTIONS

       off    Listen  for message from failed node that acknowledges node has entered kdump crash recovery service. If a valid message is received
	      from the failed node, the node is considered to be fenced and the agent returns success. Failure to receive a valid message from the
	      failed node in the given timeout period results in fencing failure.

       metadata
	      Print XML metadata to standard output.

AUTHOR

       Ryan O'Hara <rohara@redhat.com>

SEE ALSO

       fence_kdump_send(8), fenced(8), fence_node(8)

																    fence_kdump(8)

fence_scsi(8)						      System Manager's Manual						     fence_scsi(8)

NAME

       fence_scsi - I/O fencing agent for SCSI persistent reservations

SYNOPSIS

       fence_scsi [OPTION]...

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 devive(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.

       Keys  are  either  be specified manually (see -k option) or generated automatically (see -n option). Automatic key generation requires that
       cman be running. Keys will then be generated using the cluster ID and node ID such that each node has a unique key that can  be	determined
       by any other node in the cluster.

       Devices can either be specified manually (see -d option) or discovered automatically. Multiple devices can be specified manually by using a
       comma-separated list. If no devices are specified, the fence_scsi agent will attempt to discover devices by looking for cluster volumes and
       extracting  the	underlying  devices.  Devices  may  be	device-mapper multipath devices or raw devices. If using a device-mapper multipath
       device, the fence_scsi agent will find the underlying devices (paths) and created registrations for each path.

OPTIONS

       -o action
	      Fencing action. This value can be "on", "off", or "status". All actions require either a key (see -k option) or node  name  (see	-n
	      option).	For  "on", the agent will attempt to register with the device(s) and create a reservation if none exists. The "off" action
	      will attempt to remove a node's key from the device(s). The "status" action will report whether or not a	node's	key  is  currently
	      register with one or more of the devices. The default action if "off".

       -d devices
	      List of devices to use for current operation. Devices can be comma-separated list of raw device (eg. /dev/sdc) or device-mapper mul-
	      tipath devices (eg. /dev/dm-3). Each device must support SCSI-3 persistent reservations.

       -f logfile
	      Log output to file.

       -n 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.

       -k 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).

       -a     Use the APTPL flag for registrations. This option is only used for the "on" action.

       -h     Print out a help message describing available options, then exit.

       -v     Verbose output.

       -V     Print out a version message, then exit.

STDIN PARAMETERS

       agent = "param"
	      This option is used by fence_node(8) and is ignored by fence_scsi.

       nodename = "param"
	      Same as -n option.

       action = "param"
	      Same as -o option.

       devices = "param"
	      Same as -d option.

       logfile = "param"
	      Same as -f option

       key = "param"
	      Same as -k option.

       aptpl = "1"
	      Enable the APTPL flag. Default is 0 (disable).

SEE ALSO

       fence(8), fence_node(8), sg_persist(8), vgs(8), cman_tool(8), cman(5)

																     fence_scsi(8)