multipath
is used to detect multiple paths to devices for fail-over or performance reasons and coalesces them
OPTIONS
-v level
verbosity, print all paths and multipaths
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:
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
