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

NAME
       multipath - Device mapper target autoconfig

SYNOPSIS
       multipath	 [-v verbosity]		[-b bindings_file]	  [-d]
       [-h|-l|-ll|-f|-t|-F|-B|-c|-q|-r|-w|-W]		   [-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

       -t     print internal hardware table to stdout

       -r     force devmap reload

       -B     treat the bindings file as read only

       -b  bindings_file
	      set user_friendly_names bindings file location.  The default  is
	      /etc/multipath/bindings

       -c     check if a block device should be a path in a multipath device

       -q     allow device tables with queue_if_no_path when multipathd is not
	      running

       -w     remove the wwid for the specified device from the wwids file

       -W     reset the wwids file  to	only  include  the  current  multipath
	      devices

       -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-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.

	      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) hot‐
       plug(8)

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

				   July 2006			  MULTIPATH(8)

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