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# multipath - Unix, Linux Command

# NAME

multipath - Device mapper target autoconfig

# SYNOPSIS

multipath [-v verbosity] [-d] [-h|-l|-ll|-f|-F] [-p failover|multibus|group_by_serial|group_by_prio|group_by_node_name] [device]

# DESCRIPTION

multipath is used to detect multiple paths to devices for fail-over or performance reasons and coalesces them

# OPTIONS

Tag | Description
--- | ---
-v level
| verbosity, print all paths and multipaths

Tag | Description
--- | ---

Tag | Description
--- | ---
0 | no output
1 | print the created or updated multipath names only, for use to feed other tools like kpartx
2 + | print all info : detected paths, coalesced paths (ie multipaths) and device maps

-h | print usage text
-d | dry run, do not create or update devmaps
-l | show the current multipath topology from information fetched in sysfs and the device mapper
-ll | show the current multipath topology from all available information (sysfs, the device mapper, path checkers ...)
-f | flush a multipath device map specified as parameter, if unused
-F | flush all unused multipath device maps
-p policy | force maps to specified policy:

Tag | Description
--- | ---
failover | 1 path per priority group
multibus | all paths in 1 priority group
group_by_serial
| 1 priority group per serial
group_by_prio
| 1 priority group per priority value. Priorities are determined by callout programs specified as a global, per-controller or per-multipath option in the configuration file
group_by_node_name
| 1 priority group per target node name. Target node names are fetched in /sys/class/fc_transport/target*/node_name.

device | update only the devmap the path pointed by device is in. device is in the /dev/sdb (as shown by udev in the $DEVNAME variable) or major:minor format. device may alternatively be a multipath mapname

# SEE ALSO

- udev (8)

- dmsetup (8)

- hotplug (8)

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

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