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MULTIPATHD(8) 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 Forground Mode. Don't daemonize, and print all messages to std- out and stderr. -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. -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 maps|multipaths Show the multipath devices that the multipathd is monitoring. 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 config Show the currently used configuration, derived from default val- ues 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 informa- tion if they are blacklisted or not. 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 $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 $map Stop monitoring a multipath device. switch|switchgroup map $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. SEE ALSO multipath(8) kpartx(8) hotplug(8) AUTHORS multipathd was developed by Christophe Varoqui, <christophe.varo- qui@free.fr> and others. Linux Administrator's Manual November 2006 MULTIPATHD(8)