MULTIPATH(8)						   Linux Administrator's Manual 					      MULTIPATH(8)

multipath - Device mapper target autoconfig SYNOPSIS
multipath [-v verbosity] [-d] [-h|-l|-ll|-f|-t|-F-B] [-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
-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 -t print internal hardware table to stdout -r force devmap reload -B treat the bindings file as read only -p policy force new maps to use the 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-con- troller 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. Existing maps are not modified. 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
multipathd(8), multipath.conf(5), kpartx(8), udev(8), dmsetup(8) hotplug(8) AUTHORS
multipath was developed by Christophe Varoqui, <> and others. July 2006 MULTIPATH(8)

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