GNU/Linux man pages
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Syntaxe et mise en oeuvre :
GNU/Linux |
CentOS 5.6 |
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multipath(8) |
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multipath − Device mapper target autoconfig
multipath [−v verbosity] [−d] [−h|−l|−ll|−f|−F] [−p failover|multibus|group_by_serial|group_by_prio|group_by_node_name] [device]
multipath is used to detect multiple paths to devices for fail-over or performance reasons and coalesces them
−v level
verbosity, print all paths and multipaths
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0 |
no output | ||
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1 |
print the created or updated multipath names only, for use to feed other tools like kpartx | ||
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2 + |
print all info : detected paths, coalesced paths (ie multipaths) and device maps | ||
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−h |
print usage text
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−d |
dry run, do not create or update devmaps | ||
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−l |
show the current multipath topology from information fetched in sysfs and the device mapper | ||
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−ll |
show the current multipath topology from all available information (sysfs, the device mapper, path checkers ...) | ||
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−f |
flush a multipath device map specified as parameter, if unused | ||
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−F |
flush all unused multipath device maps |
−p policy
force maps to specified policy:
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failover |
1 path per priority group |
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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_transport/target*/node_name.
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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 |
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.
udev(8), dmsetup(8) hotplug(8)
multipath was developed by Christophe Varoqui, <christophe.varoqui@free.fr> and others.
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multipath(8) | |