Product and version: VTL6900 V100R005
The symptom is that a backup server cannot detect the virtual tape library.
Possible causes are:
Possible cause 1: The virtual tape library driver is not installed.
Possible cause 2: The Fibre Channel port of the VTL server and the Fibre Channel port of the backup server have different World Wide Port Names (WWPNs).
Possible cause 3: When the VTL server is directly connected to the backup server, they have different models of Fibre Channel host bus adapters (HBAs).
Possible cause 4: The backup server is faulty.
Flowchart for troubleshooting the failure to detect the virtual tape library on the backup server