The storage device was properly connected to the host through a direct connection redundant network. A LUN was mapped to the host and was owned by controller A. The host performed I/O operations on the LUN. During the operations, the optical fiber for controller A was removed, and the I/O path switched over to controller B. After the optical fiber was reinserted, the I/O path did not fail back to controller A.HBA: QLogic HBA
1.Remove and reinsert the optical fiber again. Then run the hot_add command on the host to scan for LUNs, and the upTools –S command to check whether any new paths are generated.
2.Check whether the optical fiber is damaged. If no, remove the optical fiber and insert it to another port, or add another fiber connection. If yes, replace the optical fiber. Run the hot_add command on the host to scan for LUNs, and the upTools –S command to check whether any new paths are generated.
3.It is recommended that the services be migrated to another host and the current host be restarted. After the system has recovered, migrate the services back.