Multipath Command Output; Multipath Queries With Multipath Command - Red Hat ENTERPRISE LINUX 5 DM MULTIPATH Configuration And Administration Manual

5.5. Multipath Command Output

When you create, modify, or list a multipath device, you get a printout of the current device setup. The
format is as follows.
For each multipath device:
action_if_any: alias (wwid_if_different_from_alias) [size][features]
[hardware_handler]
For each path group:
\_ scheduling_policy [path_group_priority_if_known]
[path_group_status_if_known]
For each path:
\_ host:channel:id:lun devnode major:minor [path_status]
[dm_status_if_known]
For example, the output of a multipath command might appear as follows:
mpath1 (3600d0230003228bc000339414edb8101) [size=10 GB][features="0"]
[hwhandler="0"]
\_ round-robin 0 [prio=1][active]
\_ 2:0:0:6 sdb 8:16 [active][ready]
\_ round-robin 0 [prio=1][enabled]
\_ 3:0:0:6 sdc 8:64 [active][ready]
If the path is up and ready for I/O, the status of the path is ready or active. If the path is down, the
status is faulty or failed. The path status is updated periodically by the multipathd daemon
based on the polling interval defined in the /etc/multipath.conf file.
The dm status is similar to the path status, but from the kernel's point of view. The dm status has
two states: failed, which is analogous to faulty, and active which covers all other path states.
Occasionally, the path state and the dm state of a device will temporarily not agree.
Note
When a multipath device is being created or modified, the path group status and the dm
status are not known. Also, the features are not always correct. When a multipath device
is being listed, the path group priority is not known.

5.6. Multipath Queries with multipath Command

You can use the -l and -ll options of the multipath command to display the current multipath
configuration. The -l option displays multipath topology gathered from information in sysfs and
Multipath Command Output
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