Chapter 5. Managing Multipath I/O for Devices / 5.13. Viewing Multipath I/O Status | ||||
|---|---|---|---|---|
 | 5.12. Using Multipathed Devices | 5.14. Scanning for New Devices without Rebooting |  | |
Chapter 5. Managing Multipath I/O for Devices / 5.13. Viewing Multipath I/O Status | ||||
|---|---|---|---|---|
| 5.12. Using Multipathed Devices | 5.14. Scanning for New Devices without Rebooting | | |
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 trigger the path checker to be run.
The multipath -ll option triggers the path checker, updates the path information, then displays the current status information. This option always the displays the very 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 UUID, size, features, and hardware handlers.
Paths to the device are grouped into priority groups automatically 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) one
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
