Chapter 5. Managing Multipath I/O for Devices / 5.13. Viewing Multipath I/O Status
	5.12. Using Multipathed Devices		5.14. Managing I/O in Error Situations

Viewing Multipath I/O Status

Querying the multipath I/O status outputs the current status of the multipath maps.

The multipath -l option displays the current path status as of the last time that the path checker was run. It does not run the path checker.

The multipath -ll option runs the path checker, updates the path information, then displays the current status information. This option always the displays the latest information about the path status.

At a terminal console prompt, enter

multipath -ll

This displays information for each multipathed device. For example:

3600601607cf30e00184589a37a31d911

[size=127 GB][features="0"][hwhandler="1 emc"]

\_ round-robin 0 [active][first]

  \_ 1:0:1:2 sdav 66:240  [ready ][active]

  \_ 0:0:1:2 sdr  65:16   [ready ][active]

\_ round-robin 0 [enabled]

  \_ 1:0:0:2 sdag 66:0    [ready ][active]

  \_ 0:0:0:2 sdc  8:32    [ready ][active]

For each device, it shows the device’s ID, size, features, and hardware handlers.

Paths to the device are automatically grouped into priority groups on device discovery. Only one priority group is active at a time. For an active/active configuration, all paths are in the same group. For an active/passive configuration, the passive paths are placed in separate priority groups.

The following information is displayed for each group:

Scheduling policy used to balance I/O within the group, such as round-robin
Whether the group is active, disabled, or enabled
Whether the group is the first (highest priority) group
Paths contained within the group

The following information is displayed for each path:

The physical address as host:bus:target:lun, such as 1:0:1:2
Device node name, such as sda
Major:minor numbers
Status of the device