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.\" Update the date below if you make any significant change.
.\" Make sure there are no errors with:
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.TH MULTIPATHD 8 2016-10-27 Linux
.
.
.\" ----------------------------------------------------------------------------
.SH NAME
.\" ----------------------------------------------------------------------------
.
multipathd \- Multipath daemon.
.
.
.\" ----------------------------------------------------------------------------
.SH SYNOPSIS
.\" ----------------------------------------------------------------------------
.
.B multipathd
.RB [\| \-d | \-k \|]
.RB [\| \-s \|]
.RB [\| \-v\ \c
.IR verbosity \|]
.RB [\| \-B \|]
.RB [\| \-w \|]
.
.
.\" ----------------------------------------------------------------------------
.SH DESCRIPTION
.\" ----------------------------------------------------------------------------
.
The \fBmultipathd\fR 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 \fBmultipath\fR 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.
.
.
.\" ----------------------------------------------------------------------------
.SH OPTIONS
.\" ----------------------------------------------------------------------------
.
.TP
.B \-d
Foreground Mode. Don't daemonize, and print all messages to stdout and stderr.
.
.TP
.B \-s
Suppress timestamps. Do not prefix logging messages with a timestamp.
.
.TP
.BI \-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.
.
.TP
.B \-B
Read-only bindings file. multipathd will not write to the \fIuser_friendly_names\fR
bindings file. If a \fIuser_friendly_name\fR doesn't already exist for a device, it
will use its WWID as its alias.
.
.TP
.B \-k
multipathd will enter interactive mode. From this mode, the available commands can
be viewed by entering '\fIhelp\fR'. When you are finished entering commands, press
\fBCTRL-D\fR to quit.
.
.TP
.B \-n
\fBIGNORED\fR. Use the option
\fIfind_multipaths\fR to control the treatment of newly detected devices by
multipathd. See
.BR multipath.conf(5).
.
.TP
.B \-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 creating a seperate thread for each device.
.
.
.
.\" ----------------------------------------------------------------------------
.SH COMMANDS
.\" ----------------------------------------------------------------------------
.
.TP
The following commands can be used in interactive mode:
.
.TP
.B list|show paths
Show the paths that multipathd is monitoring, and their state.
.
.TP
.B list|show paths format $format
Show the paths that multipathd is monitoring, using a format string with path
format wildcards.
.
.TP
.B list|show maps|multipaths
Show the multipath devices that the multipathd is monitoring.
.
.TP
.B 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.
.
.TP
.B list|show maps|multipaths status
Show the status of all multipath devices that the multipathd is monitoring.
.
.TP
.B list|show maps|multipaths stats
Show some statistics of all multipath devices that the multipathd is monitoring.
.
.TP
.B list|show maps|multipaths topology
Show the current multipath topology. Same as '\fImultipath \-ll\fR'.
.
.TP
.B list|show topology
Show the current multipath topology. Same as '\fImultipath \-ll\fR'.
.
.TP
.B 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 '\fIlist maps\fR'.
.
.TP
.B list|show wildcards
Show the format wildcards used in interactive commands taking $format.
.
.TP
.B list|show config
Show the currently used configuration, derived from default values and values
specified within the configuration file \fI/etc/multipath.conf\fR.
.
.TP
.B list|show config local
Show the currently used configuration like \fIshow config\fR, but limiting
the devices section to those devices that are actually present in the system.
.
.TP
.B list|show blacklist
Show the currently used blacklist rules, derived from default values and values
specified within the configuration file \fI/etc/multipath.conf\fR.
.
.TP
.B list|show devices
Show all available block devices by name including the information if they are
blacklisted or not.
.
.TP
.B 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.
.
.TP
.B list|show daemon
Show the current state of the multipathd daemon.
.
.TP
.B add path $path
Add a path to the list of monitored paths. $path is as listed in /sys/block (e.g. sda).
.
.TP
.B remove|del path $path
Stop monitoring a path. $path is as listed in /sys/block (e.g. sda).
.
.TP
.B 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).
.
.TP
.B remove|del map|multipath $map
Stop monitoring a multipath device.
.
.TP
.B resize map|multipath $map
Resizes map $map to the given size.
.
.TP
.B 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.
.
.TP
.B reconfigure
Reconfigures the multipaths. This should be triggered automatically after anyi
hotplug event.
.
.TP
.B suspend map|multipath $map
Sets map $map into suspend state.
.
.TP
.B resume map|multipath $map
Resumes map $map from suspend state.
.
.TP
.B reset map|multipath $map
Reassign existing device-mapper table(s) use use the multipath device, instead
of its path devices.
.
.TP
.B reload map|multipath $map
Reload a multipath device.
.
.TP
.B fail path $path
Sets path $path into failed state.
.
.TP
.B reinstate path $path
Resumes path $path from failed state.
.
.TP
.B disablequeueing maps|multipaths
Disable queueing on all multipath devices.
.
.TP
.B restorequeueing maps|multipaths
Restore queueing on all multipath devices.
.
.TP
.B disablequeueing map|multipath $map
Disable queuing on multipathed map $map.
.
.TP
.B restorequeueing map|multipath $map
Restore queuing on multipahted map $map.
.
.TP
.B forcequeueing daemon
Forces multipathd into queue_without_daemon mode, so that no_path_retry queueing
will not be disabled when the daemon stops.
.
.TP
.B restorequeueing daemon
Restores configured queue_without_daemon mode.
.
.TP
.B map|multipath $map setprstatus
Enable persistent reservation management on $map.
.
.TP
.B map|multipath $map unsetprstatus
Disable persistent reservation management on $map.
.
.TP
.B map|multipath $map getprstatus
Get the current persistent reservation management status of $map.
.
.TP
.B map|multipath $map getprkey
Get the current persistent reservation key associated with $map.
.
.TP
.B map|multipath $map setprkey key $key
Set the persistent reservation key associated with $map to $key in the
\fIprkeys_file\fR. This key will only be used by multipathd if
\fIreservation_key\fR is set to \fBfile\fR in \fI/etc/multipath.conf\fR.
.
.TP
.B map|multipath $map unsetprkey
Remove the persistent reservation key associated with $map from the
\fIprkeys_file\fR. This will only unset the key used by multipathd if
\fIreservation_key\fR is set to \fBfile\fR in \fI/etc/multipath.conf\fR.
.
.TP
.B path $path setmarginal
move $path to a marginal pathgroup. The path will remain in the marginal
path group until \fIunsetmarginal\fR is called. This command will only
work if \fImarginal_pathgroups\fR is enabled and there is no Shaky paths
detection method configured (see the multipath.conf man page for details).
.
.TP
.B path $path unsetmarginal
return marginal path $path to its normal pathgroup. This command will only
work if \fImarginal_pathgroups\fR is enabled and there is no Shaky paths
detection method configured (see the multipath.conf man page for details).
.
.TP
.B map $map unsetmarginal
return all marginal paths in $map to their normal pathgroups. This command
will only work if \fImarginal_pathgroups\fR is enabled and there is no Shaky
paths detection method configured (see the multipath.conf man page for details).
.
.TP
.B quit|exit
End interactive session.
.
.TP
.B shutdown
Stop multipathd.
.
.
.\" ----------------------------------------------------------------------------
.SH "SYSTEMD INTEGRATION"
.\" ----------------------------------------------------------------------------
.
When compiled with systemd support two systemd service files are installed,
\fImultipathd.service\fR and \fImultipathd.socket\fR The \fImultipathd.socket\fR
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 \fImultipathd.service\fR file carries the definitions for controlling the
multipath daemon. The daemon itself uses the \fBsd_notify\fR(3) interface to
communicate with systemd. The following unit keywords are recognized:
.
.TP
.B WatchdogSec=
Enables the internal watchdog from systemd. multipath will send a
notification via \fBsd_notify\fR(3) to systemd to reset the watchdog. If
specified the \fIpolling_interval\fR and \fImax_polling_interval\fR 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 \fImultipathd.service\fR file.
.
.TP
.B OOMScoreAdjust=
Overrides the internal OOM adjust mechanism.
.
.TP
.B LimitNOFILE=
Overrides the \fImax_fds\fR configuration setting.
.
.
.\" ----------------------------------------------------------------------------
.SH "SEE ALSO"
.\" ----------------------------------------------------------------------------
.
.BR multipath (8),
.BR kpartx (8),
.BR sd_notify (3),
.BR system.service (5).
.
.
.\" ----------------------------------------------------------------------------
.SH AUTHORS
.\" ----------------------------------------------------------------------------
.
\fImultipath-tools\fR was developed by Christophe Varoqui <christophe.varoqui@opensvc.com>
and others.
.\" EOF