Hi team, here's a new case.
Problem
After services are stopped and the storage is upgraded, the status of some LUN paths on the AIX host is Failed, but the host services are normal.
Symptom
After services are stopped and the storage is upgraded, the status of some LUN paths on the AIX host is Failed, but the host services are normal. Run the lspath command to check the status of some paths. The status of some paths is not Failed.
As shown in the following figure:
Cause
AIX self-developed multipathing software is implemented based on the MPIO framework.
When a disk is not in use, the disk is in the Closed state in the kernel.
In this state, you cannot send routine test commands to check the disk path status.
If UltraPath earlier than V100R008C00SPC300 is used or the built-in multipathing software of AIX is used, When a disk is not in use and a link fault occurs, the system cannot send routine test commands to query the latest status of the disk path.
As a result, the path status cannot be restored to Enabled.
Once the disk is in use, the path state is updated to the latest state.
IBM's note on this issue:
https://www.ibm.com/support/knowledgecenter/en/ssw_aix_71/com.ibm.aix.osdevice/devpathctrlmodatts.htm
Location Method
1. Confirm the LUNs whose links are not restored.
Run the lspath command to query links.
Record the drive letter whose link status is Failed. In addition, ensure that all LUN links are in the Enabled state, indicating that all physical links are normal.
2. Run the following command to confirm that failed drives exist on the link and no service I/O is available.
iostat 3 |grep hdiskXXX
Solution
Temporary solution:
Run the chpath -s enable -l hdiskXXX command to manually set the status.
Solution
Install or upgrade UltraPath to V100R008C00SPC300.
Post-Recovery Check
Run the lspath command on the AIX host to check whether all paths are in the Enabled state
