MULTIPATHD(8) System Manager's Manual MULTIPATHD(8)
NAME
multipathd - Multipath daemon.
SYNOPSIS
multipathd [-d] [-s] [-v verbosity] [-B] [-w]
multipathd [-v verbosity] -kcommand
multipathd [-v verbosity] -k
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.
With the -k option, multipathd acts as a client utility that sends com-
mands to a running instance of the multipathd daemon (see COMMANDS be-
low).
OPTIONS
-d Foreground Mode. Don't daemonize, and print all messages to std-
out and stderr.
-s Suppress timestamps. Do not prefix logging messages with a time-
stamp.
-v level
Verbosity level. Print additional information while running mul-
tipathd. 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 bindings file. If a user_friendly_name
doesn't already exist for a device, it will use its WWID as its
alias.
-kcommand
multipathd executes the given command (see COMMANDS below). If
the command contains whitespace or shell special characters, it
needs to be quoted like in multipathd -k'show topology'. No
whitespace is allowed between the -k and the command string.
-k multipathd executes the multipathc interactive shell for enter-
ing commands (see COMMANDS below).
-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 waiting method, based on creat-
ing a separate 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 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 wild-
cards.
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 multi-
pathd 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 val-
ues and values specified within the configuration file /etc/mul-
tipath.conf.
list|show config local
Show the currently used configuration like show config, but lim-
iting 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 informa-
tion 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 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|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 de-
vices. 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 re-
gardless 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 de-
vice, 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 multipath.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 configured (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 in-
stalled, multipathd.service and multipathd.socket The multipathd.socket
service instructs systemd to intercept 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 watch-
dog. 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 default, but has to be enabled manu-
ally by updating the multipathd.service file.
OOMScoreAdjust=
Overrides the internal OOM adjust mechanism.
LimitNOFILE=
Overrides the max_fds configuration setting.
SEE ALSO
multipathc(8), multipath(8), kpartx(8)
sd_notify(3), systemd.service(5).
AUTHORS
multipath-tools was developed by Christophe Varoqui <christophe.varo-
qui@opensvc.com> and others.
Linux 2022-09-03 MULTIPATHD(8)
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