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MULTIPATHD(8) System Manager's Manual MULTIPATHD(8)
NAME
multipathd - Multipath daemon.
SYNOPSIS
multipathd [-d|-k] [-s] [-v verbosity] [-B] [-w]
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 maxi-
mum performance and redundancy.
This daemon executes the external multipath tool when events occur. In turn, the multi-
path tool signals the multipathd daemon when it is done with devmap reconfiguration, so
that it can refresh its failed path list.
OPTIONS
-d Foreground Mode. Don't daemonize, and print all messages to stdout and stderr.
-s Suppress timestamps. Do not prefix logging messages with a timestamp.
-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.
-B Read-only bindings file. multipathd will not write to the user_friendly_names bind-
ings file. If a user_friendly_name doesn't already exist for a device, it will use
its WWID as its alias.
-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.
-n IGNORED. Use the option find_multipaths to control the treatment of newly detected
devices by multipathd. See multipath.conf(5).
-w Since kernel 4.14 a new device-mapper event polling interface is used for updating
multipath devices on dmevents. Use this flag to force it to use the old event wait-
ing method, based on creating a seperate thread for each device.
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 for-
mat 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, for example
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 spec-
ified within the configuration file /etc/multipath.conf.
list|show config local
Show the currently used configuration like show config, but limiting the devices
section to those devices that are actually present in the system.
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.
list|show daemon
Show the current state of the multipathd daemon.
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|multipath $map
Add a multipath device to the list of monitored devices. $map can either be a de-
vice-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|multipath $map
Stop monitoring a multipath device.
resize map|multipath $map
Resizes map $map to the given size.
switch|switchgroup map|multipath $map group $group
Force a multipath device to switch to a specific path group. $group is the path
group index, starting with 1.
reconfigure
Rereads the configuration, and reloads all changed multipath devices. This also
happens at startup, when the service is reload, or when a SIGHUP is received.
reconfigure all
Rereads the configuration, and reloads all multipath devices regardless of whether
or not they have changed. This also happens when multipath -r is run.
suspend map|multipath $map
Sets map $map into suspend state.
resume map|multipath $map
Resumes map $map from suspend state.
reset map|multipath $map
Reassign existing device-mapper table(s) use the multipath device, instead of its
path devices.
reload map|multipath $map
Reload a multipath device.
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.
forcequeueing daemon
Forces multipathd into queue_without_daemon mode, so that no_path_retry queueing
will not be disabled when the daemon stops.
restorequeueing daemon
Restores configured queue_without_daemon mode.
map|multipath $map setprstatus
Enable persistent reservation management on $map.
map|multipath $map unsetprstatus
Disable persistent reservation management on $map.
map|multipath $map getprstatus
Get the current persistent reservation management status of $map.
map|multipath $map getprkey
Get the current persistent reservation key associated with $map.
map|multipath $map setprkey key $key
Set the persistent reservation key associated with $map to $key in the prkeys_file.
This key will only be used by multipathd if reservation_key is set to file in
/etc/multipath.conf.
map|multipath $map unsetprkey
Remove the persistent reservation key associated with $map from the prkeys_file.
This will only unset the key used by multipathd if reservation_key is set to file
in /etc/multipath.conf.
path $path setmarginal
move $path to a marginal pathgroup. The path will remain in the marginal path group
until unsetmarginal is called. This command will only work if marginal_pathgroups
is enabled and there is no Shaky paths detection method configured (see the multi-
path.conf man page for details).
path $path unsetmarginal
return marginal path $path to its normal pathgroup. This command will only work if
marginal_pathgroups is enabled and there is no Shaky paths detection method config-
ured (see the multipath.conf man page for details).
map $map unsetmarginal
return all marginal paths in $map to their normal pathgroups. This command will
only work if marginal_pathgroups is enabled and there is no Shaky paths detection
method configured (see the multipath.conf man page for details).
quit|exit
End interactive session.
shutdown
Stop multipathd.
SYSTEMD INTEGRATION
When compiled with systemd support two systemd service files are installed, multi-
pathd.service and multipathd.socket The multipathd.socket service instructs systemd to in-
tercept the CLI command socket, so that any call to the CLI interface will start-up the
daemon if required. The multipathd.service file carries the definitions for controlling
the multipath daemon. The daemon itself uses the sd_notify(3) interface to communicate
with systemd. The following unit keywords are recognized:
WatchdogSec=
Enables the internal watchdog from systemd. multipath will send a notification via
sd_notify(3) to systemd to reset the watchdog. If specified the polling_interval
and max_polling_interval settings will be overridden by the watchdog settings.
Please note that systemd prior to version 207 has issues which prevent the systemd-
provided watchdog from working correctly. So the watchdog is not enabled per de-
fault, but has to be enabled manually by updating the multipathd.service file.
OOMScoreAdjust=
Overrides the internal OOM adjust mechanism.
LimitNOFILE=
Overrides the max_fds configuration setting.
SEE ALSO
multipath(8), kpartx(8), sd_notify(3), system.service(5).
AUTHORS
multipath-tools was developed by Christophe Varoqui <christophe.varoqui AT opensvc.com> and
others.
Linux 2016-10-27 MULTIPATHD(8)
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