Product and version information:
The operating system of application servers running Linux or UNIX.
A storage device and an application server use the switch networking mode (Fibre Channel switches). Two initiators of the application server are added to Host1 and Host2 respectively on the storage device. After the upTools –S command is executed to check the LUN link status, Path State is displayed as Down.
Figure 1-1 shows the switch networking mode.
Figure 1-1 Switch networking mode
After the LUN status of the storage device is checked, the health status of LUNs is normal.
After host LUN IDs of LUNs mapped to the application server are checked, overlapped host LUN IDs exist.