Our production using the encryption key manager to FC tapes , after replace the tape , then delete drive the NBU console, and use device wizard to connect to new tape drive. I can see the serial number of tape on the nbu console, and run tpconfig -l ,the tape has been replaced. Use the test backup job , it should the robot operation failed. The FC tape connect to active and standby master cluster server , and one media server. I use the sgbuild the link and scan , and see the tapes, then boot the master server and media server, then run the test backup , it should media error 96. I have no idea what happen on this. Is it any wrong with the steps? Please advice .