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

NAME

       multipathd - multipath daemon

SYNOPSIS

       multipathd [options]

DESCRIPTION

       The  multipathd daemon is in charge of checking for failed paths. When this happens, it will reconfigure the multipath map the path belongs
       to, so that this map regains its maximum performance and redundancy.

       This daemon executes the external multipath config tool when events occur.  In turn, the multipath tool signals the multipathd daemon  when
       it is done with devmap reconfiguration, so that it can refresh its failed path list.

OPTIONS

       -d     Forground Mode. Don't daemonize, and print all messages to stdout and stderr.

       -v level
	      Verbosity  level.  Print	additional  information  while	running multipathd. A  level of 0 means only print errors. A level of 3 or
	      greater prints debugging information as well.

       -k     multipathd will enter interactive mode. From this mode, the available commands can be viewed by entering "help". When you  are  fin-
	      ished entering commands, press CTRL-D to quit.

COMMANDS

       The following commands can be used in interactive mode:

       list|show paths
	      Show the paths that multipathd is monitoring, and their state.

       list|show paths format $format
	      Show the paths that multipathd is monitoring, using a format string with path format wildcards.

       list|show maps|multipaths
	      Show the multipath devices that the multipathd is monitoring.

       list|show maps|multipaths format $format
	      Show the status of all multipath devices that the multipathd is monitoring, using a format string with multipath format wildcards.

       list|show maps|multipaths status
	      Show the status of all multipath devices that the multipathd is monitoring.

       list|show maps|multipaths stats
	      Show some statistics of all multipath devices that the multipathd is monitoring.

       list|show maps|multipaths topology
	      Show the current multipath topology. Same as "multipath -ll".

       list|show topology
	      Show the current multipath topology. Same as "multipath -ll".

       list|show map|multipath $map topology
	      Show  topology  of  a single multipath device specified by $map, e.g. 36005076303ffc56200000000000010aa.	This map could be obtained
	      from "list maps".

       list|show wildcards
	      Show the format wildcards used in interactive commands taking $format

       list|show config
	      Show the currently used configuration, derived from default values and values specified within the  configuration  file  /etc/multi-
	      path.conf.

       list|show blacklist
	      Show  the currently used blacklist rules, derived from default values and values specified within the configuration file /etc/multi-
	      path.conf.

       list|show devices
	      Show all available block devices by name including the information if they are blacklisted or not.

       list|show status
	      Show the number of path checkers in each possible state, the number of monitored paths, and whether multipathd is currently handling
	      a uevent.

       add path $path
	      Add a path to the list of monitored paths. $path is as listed in /sys/block (e.g. sda).

       remove|del path $path
	      Stop monitoring a path. $path is as listed in /sys/block (e.g. sda).

       add map $map
	      Add  a  multipath  device  to the list of monitored devices. $map can either be a device-mapper device as listed in /sys/block (e.g.
	      dm-0)  or  it  can  be  the  alias  for  the  multipath  device  (e.g.  mpath1)  or  the	uid  of   the	multipath   device   (e.g.
	      36005076303ffc56200000000000010aa).

       remove|del map $map
	      Stop monitoring a multipath device.

       resize map|multipath $map
	      Resizes map $map to the given size

       switch|switchgroup map $map group $group
	      Force a multipath device to switch to a specific path group. $group is the path group index, starting with 1.

       reconfigure
	      Reconfigures the multipaths. This should be triggered automatically after any hotplug event.

       suspend map|multipath $map
	      Sets map $map into suspend state.

       resume map|multipath $map
	      Resumes map $map from suspend state.

       fail path $path
	      Sets path $path into failed state.

       reinstate path $path
	      Resumes path $path from failed state.

       disablequeueing maps|multipaths
	      Disable queueing on all multipath devices.

       restorequeueing maps|multipaths
	      Restore queueing on all multipath devices.

       disablequeueing map|multipath $map
	      Disable queuing on multipathed map $map

       restorequeueing map|multipath $map
	      Restore queuing on multipahted map $map

       quit|exit
	      End interactive session.

SEE ALSO

       multipath(8) kpartx(8) hotplug(8)

AUTHORS

       multipathd was developed by Christophe Varoqui, <christophe.varoqui@opensvc.com> and others.

Linux Administrator's Manual					   November 2009						     MULTIPATHD(8)