Do you mean the library is not recognaissed in BE?
- if so, check if teh OS recognaisse it
- check if the library is supported with that version of BE by looking at the SCL (software compatibility list)
- did the device work before or is newly attached to that server
- how is it connected
Do you mean you want to see what data is on a tape?
- then you need to run an inventory and catalog operation against that tape.