After the coin batteries of the two controllers in OceanStor S5600T is replaced, a customer's AIX host detects that a path of disk hdisk2 is failed. The multipathing software used is MPIO provided by the AIX host.
1. Check the status of all paths before replacing coin batteries. All paths are enabled.
2. Query the paths of hdisk2.
3. Collect storage logs. No alarm information exists. Paths of all LUNs on controllers A and B are enabled.4. Run the chpath -s enable -l hdisk2 command to enable paths of hdisk2. The issue is fixed.
The multipathing policy provided by AIX is as follows: If an FC link is down, the host will not check the logical status of the corresponding disk. As a result, if the physical links of the host recovered after being disconnected, logical links of unused disks will not be enabled automatically until the disks are being used. Alternatively, users can run the chpath -s enable -l hdiskX command to manually enable such links.
Run the chpath -s enable -l hdisk2 command to enable paths of hdisk2.