1 .TH MULTIPATH 8 "February 2004" "" "Linux Administrator's Manual"
3 multipath \- Device mapper target autoconfig
13 .BR failover | multibus | group_by_serial | group_by_prio | group_by_node_name \|]
17 is used to detect multiple paths to devices for fail-over or performance reasons and coalesces them
21 verbosity, print all paths and multipaths
28 print the created or updated multipath names only, for use to feed other tools like kpartx
31 print all info : detected paths, coalesced paths (ie multipaths) and device maps
35 dry run, do not create or update devmaps
38 show the current multipath topology from information fetched in sysfs and the device mapper
41 show the current multipath topology from all available information (sysfs, the device mapper, path checkers ...)
45 multipath target param: polling interval
47 .BI \-D " major:minor"
48 update only the devmap the path pointed by
53 flush all unused multipath device maps
56 force maps to specified policy:
60 1 path per priority group
63 all paths in 1 priority group
66 1 priority group per serial
69 1 priority group per priority value. Priorities are determined by callout programs specified as a global, per-controler or per-multipath option in the configuration file
72 1 priority group per target node name. Target node names are fetched in /sys/class/fc_transport/target*/node_name.
76 update only the devmap the path pointed by
80 is in the /dev/sdb (as shown by udev in the $DEVNAME variable) or major:minor format.
82 may alternatively be a multipath mapname
89 was developed by Christophe Varoqui, <christophe.varoqui@free.fr> and others.