红帽全球峰会1.6. Path status
Path status indicates the current state of individual storage paths, ranging from ready and functional to faulty or delayed, helping determine multipath device health and behavior.
The path status is updated periodically by the multipathd daemon based on the polling interval defined in the /etc/multipath.conf file. In terms of the kernel, the dm status is similar to the path status. The dm state will retain its current status until the path checker has completed.
- Path status
- ready, ghost
- The path is up and ready for I/O.
- faulty, shaky
- The path is down.
- i/o pending
- The checker is actively checking this path, and the state will be updated shortly.
- i/o timeout
-
The checker did not return
success/failurebefore the timeout period. This is treated the same asfaulty. - removed
-
The path has been removed from the system, and will shortly be removed from the multipath device. This is treated the same as
faulty. - wild
-
multipathdwas unable to run the path checker, because of an internal error or configuration issue. This is treated the same asfaulty, except multipath will skip many actions on the path. - unchecked
-
The path checker has not run on this path, either because it has just been discovered, it does not have an assigned path checker, or the path checker encountered an error. This is treated the same as
wild. - delayed
-
The path checker returns that the path is up, but multipath is delaying the reinstatement of the path because the path has recently failed multiple times and multipath has been configured to delay paths in this case. This is treated the same as
faulty.
- Dm status
- Active
-
Maps to the
readyandghostpath status. - Failed
-
Maps to all other path status, except
i/o pendingthat does not have an equivalentdmstate.
- Online status
- Running
- The device is enabled.
- Offline
- The device has been disabled.
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