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 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 bindings 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.
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.
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
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.
reset map|multipath $map
Reassign existing device-mapper table(s) use 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
quit|exit
End interactive session.
shutdown
Stop multipathd.
SYSTEMD INTEGRATION
When compiled with systemd support two systemd service files are
installed, 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
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 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 ALSO
multipath(8) kpartx(8) sd_notify(3) system.service(5)
AUTHORS
multipathd was developed by Christophe Varoqui, <christophe.varoqui@opensvc.com> and others.
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