multipathd(8) - Linux man page

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 status: Show the number of monitored paths in each path checker state.
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.
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).
paths count: Show the number of monitored paths, and whether multipathd is currently handeling a uevent.
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.

Authors

multipathd was developed by Christophe Varoqui, <christophe.varoqui@free.fr> and others.

Referenced By

mpathconf(8), multipath.conf(5)