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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
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Tag | Description |
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Tag | Description |
0 |
no output
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1 |
print the created or updated multipath names only, for use to feed other tools like kpartx
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2 + |
print all info : detected paths, coalesced paths (ie multipaths) and device maps
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-h |
print usage text
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-d |
dry run, do not create or update devmaps
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-l |
show the current multipath topology from information fetched in sysfs and the device mapper
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-ll |
show the current multipath topology from all available information (sysfs, the device mapper, path checkers ...)
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-f |
flush a multipath device map specified as parameter, if unused
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-F |
flush all unused multipath device maps
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-p policy |
force maps to specified policy:
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Tag | Description |
failover |
1 path per priority group
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multibus |
all paths in 1 priority group
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group_by_serial | |
1 priority group per serial
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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
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group_by_node_name | |
1 priority group per target node name. Target node names are fetched in /sys/class/fc_transport/target*/node_name.
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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
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SEE ALSO
multipath was developed by Christophe Varoqui, <christophe.varoqui@free.fr> and others.
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