5.7. Multipath Command Output
When you create, modify, or list a multipath device, you get a display of the current device setup. The format is as follows.
각각의 멀티패스 장치의 경우:
action_if_any: alias (wwid_if_different_from_alias) dm_device_name_if_known vendor,product size=size features='features' hwhandler='hardware_handler' wp=write_permission_if_known
각각의 경로 그룹의 경우:
-+- policy='scheduling_policy' prio=prio_if_known status=path_group_status_if_known
각각의 경로의 경우:
`- host:channel:id:lun devnode major:minor dm_status_if_known path_status online_status
예를 들어, multipath 명령의 출력 결과는 다음과 같이 나타나게 됩니다:
3600d0230000000000e13955cc3757800 dm-1 WINSYS,SF2372 size=269G features='0' hwhandler='0' wp=rw |-+- policy='round-robin 0' prio=1 status=active | `- 6:0:0:0 sdb 8:16 active ready running `-+- policy='round-robin 0' prio=1 status=enabled `- 7:0:0:0 sdf 8:80 active ready running
If the path is up and ready for I/O, the status of the path is
ready or ghost. If the path is down, the status is faulty or shaky. 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.
The possible values for
online_status are running and offline. A status of offline means that this SCSI device has been disabled.
참고
When a multipath device is being created or modified, the path group status, the dm device name, the write permissions, and the dm status are not known. Also, the features are not always correct.
