1 .TH MULTIPATH 8 "July 2006" "" "Linux Administrator's Manual"
3 multipath \- Device mapper target autoconfig
9 .RB [\| \-h | \-l | \-ll | \-f | \-t | \-F \| \-B \|]
11 .BR failover | multibus | group_by_serial | group_by_prio | group_by_node_name \|]
15 is used to detect multiple paths to devices for fail-over or performance reasons and coalesces them
19 verbosity, print all paths and multipaths
26 print the created or updated multipath names only, for use to feed other tools like kpartx
29 print all info : detected paths, coalesced paths (ie multipaths) and device maps
36 dry run, do not create or update devmaps
39 show the current multipath topology from information fetched in sysfs and the device mapper
42 show the current multipath topology from all available information (sysfs, the device mapper, path checkers ...)
45 flush a multipath device map specified as parameter, if unused
48 flush all unused multipath device maps
51 print internal hardware table to stdout
57 treat the bindings file as read only
60 force new maps to use the specified policy:
64 1 path per priority group
67 all paths in 1 priority group
70 1 priority group per serial
73 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
76 1 priority group per target node name. Target node names are fetched
77 in /sys/class/fc_transport/target*/node_name.
80 Existing maps are not modified.
83 update only the devmap the path pointed by
87 is in the /dev/sdb (as shown by udev in the $DEVNAME variable) or major:minor format.
89 may alternatively be a multipath mapname
92 .BR multipath.conf (5),
99 was developed by Christophe Varoqui, <christophe.varoqui@opensvc.com> and others.