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 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 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/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.

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.