MULTIPATHD(8)                                                                                                      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  mul-
       tipathd 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 finished 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 maps|multipaths
              Show the multipath devices that the multipathd is monitoring.

       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 config
              Show the currently used configuration, derived from default values and values specified within  the  configuration
              file /etc/multipath.conf.

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

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

       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 map|multipath $map
              Disabled queuing on multipathed map $map

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


SEE ALSO
       multipath(8) kpartx(8) hotplug(8)

AUTHORS
       multipathd was developed by Christophe Varoqui, <christophe.varoquiATfree.fr> and others.



Linux Administrator's Manual                              November 2009                                            MULTIPATHD(8)