1 .TH MULTIPATH 8 "July 2006" "" "Linux Administrator's Manual"
3 multipath \- Device mapper target autoconfig
9 .RB [\| \-l | \-ll | \-f | \-F \|]
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
33 dry run, do not create or update devmaps
36 show the current multipath topology from information fetched in sysfs and the device mapper
39 show the current multipath topology from all available information (sysfs, the device mapper, path checkers ...)
42 .BI \-D " major:minor"
43 update only the devmap the path pointed by
48 flush a multipath device map specified as parameter, if unused
51 flush all unused multipath device maps
54 force maps to specified policy:
58 1 path per priority group
61 all paths in 1 priority group
64 1 priority group per serial
67 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
70 1 priority group per target node name. Target node names are fetched in /sys/class/fc_transport/target*/node_name.
74 update only the devmap the path pointed by
78 is in the /dev/sdb (as shown by udev in the $DEVNAME variable) or major:minor format.
80 may alternatively be a multipath mapname
87 was developed by Christophe Varoqui, <christophe.varoqui@free.fr> and others.