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
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.
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.
- 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.
- resize map|multipath $map
- Resizes map $map to the given size
- 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
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 multipahted map $map
- quit|exit
- End interactive session.
SEE ALSO¶
multipath(8) kpartx(8) hotplug(8)
AUTHORS¶
multipathd was developed by Christophe Varoqui,
<christophe.varoqui@opensvc.com> and others.