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

NAME
       multipath - Device mapper target autoconfig

SYNOPSIS
       multipath  [-v verbosity] [-d] [-h|-l|-ll|-f|-F|-B] [-p failover|multi‐
       bus|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  informa‐
	      tion (sysfs, the device mapper, path checkers ...)

       -f     flush a multipath device map specified as parameter, if unused

       -F     flush all unused multipath device maps

       -B     treat the bindings file as read only

       -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_trans‐
			       port/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

NOTES
       a  map  may  be	unused if, eg, the file system on it is not mounted or
       there are no open file descriptors against the device file, as in a raw
       device.

SEE ALSO
       udev(8), dmsetup(8) hotplug(8)

AUTHORS
       multipath   was	developed  by  Christophe  Varoqui,  <christophe.varo‐
       qui@free.fr> and others.

				   July 2006			  MULTIPATH(8)

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