MULTIPATHD(8)MULTIPATHD(8)NAMEmultipathd - multipath daemon
SYNOPSISmultipathd [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 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.
-kmultipathd 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 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,
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 val‐
ues and values specified within the configuration file /etc/mul‐
tipath.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 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.
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
Reconfigures the multipaths. This should be triggered automati‐
cally 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.
SYSTEMD INTEGRATION
When compiled with systemd support two systemd service files are
installed, multipathd.service and multipathd.socket The multi‐
pathd.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
manually by updating the multipathd.service file.
OOMScoreAdjust=
Overrides the internal OOM adjust mechanism
LimitNOFILE=
Overrides the max_fds configuration setting.
SEE ALSOmultipath(8)kpartx(8)sd_notify(3)system.service(5)AUTHORSmultipathd was developed by Christophe Varoqui, <christophe.varo‐
qui@opensvc.com> and others.
Linux Administrator's Manual November 2009 MULTIPATHD(8)
