# phpman > man > multipathd(8) [MULTIPATHD(8)](https://www.chedong.com/phpMan.php/man/MULTIPATHD/8/markdown) System Manager's Manual [MULTIPATHD(8)](https://www.chedong.com/phpMan.php/man/MULTIPATHD/8/markdown) ## 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 maximum per‐ formance and redundancy. This daemon executes the external **multipath** 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 ### -s ### -v 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 file. If a _user_friendly_name_ doesn't already exist for a device, it will use its WWID as its alias. ### -k viewed by entering '_help_'. When you are finished entering commands, press **CTRL-D** to quit. ### -n vices by multipathd. See [**multipath.conf(5)](https://www.chedong.com/phpMan.php/man/multipath.conf/5/markdown).** ### -w 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. ## 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, 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 speci‐ fied within the configuration file _/etc/multipath.conf_. ### list|show config local Show the currently used configuration like _show_ _config_, but limiting the devices sec‐ tion 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 speci‐ fied within the configuration file _/etc/multipath.conf_. ### list|show devices Show all available block devices by name including the information if they are black‐ listed 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 mul‐ tipath 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 hap‐ pens 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 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 installed, _multipathd.ser__‐ _vice_ 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 re‐ quired. The _multipathd.service_ file carries the definitions for controlling the multipath daemon. The daemon itself uses the **sd**___**[notify**(3)](https://www.chedong.com/phpMan.php/man/notify/3/markdown) 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)](https://www.chedong.com/phpMan.php/man/notify/3/markdown) 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)](https://www.chedong.com/phpMan.php/man/multipath/8/markdown), [**kpartx**(8)](https://www.chedong.com/phpMan.php/man/kpartx/8/markdown), **sd**___**[notify**(3)](https://www.chedong.com/phpMan.php/man/notify/3/markdown), [**system.service**(5)](https://www.chedong.com/phpMan.php/man/system.service/5/markdown). ## AUTHORS _multipath-tools_ was developed by Christophe Varoqui <> and oth‐ ers. Linux 2016-10-27 [MULTIPATHD(8)](https://www.chedong.com/phpMan.php/man/MULTIPATHD/8/markdown)