MULTIPATHD - Online Linux Manual PageSection : 8
Updated : November 2009
Source : Linux Administrator's Manual

NAMEmultipathd − multipath daemon

SYNOPSISmultipathd [options]

DESCRIPTIONThe 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 stdout and stderr. -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. -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.

COMMANDSThe 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 paths raw format $format  Show the paths that multipathd is monitoring, using a format string with path format wildcards. No headers will be printed and no padding will be applied to the strings. list|show status  Show the number of monitored paths in each path checker state. list|show maps|multipaths  Show the multipath devices that the multipathd is monitoring. list|show daemon  Show the current state of the multipathd daemon 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 raw format $format  Show the status of all multipath devices that the multipathd is monitoring, using a format string with multipath format wildcards. No headers will be printed and no padding will be applied to the strings. 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. 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). paths count  Show the number of monitored paths, and whether multipathd is currently handling a uevent. 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. 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 multipathed 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.

SEE ALSOmultipath(8) kpartx(8) hotplug(8)

AUTHORSmultipathd was developed by Christophe Varoqui, <christophe.varoqui@free.fr> and others.
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