Hi @MNCHR ,

To make sure I understood well, this tape library has been replaced by a same one, on the same ntbackup4 server ?

If so, has it been done hot, without rescan, or reboot after the operation ?

If it’s the case, maybe the SCSI ID has changed between the 2.

You could also go to Expert Storage Configuration, select that MA, and try to configure/reconfigure/detect, depending on what you see (and your level of trust / knowledge of that part ), else don’t go too far or you could have to reconfigure many things.. 

Thank you for your prompt reply. No, it's an existing tape library. According to my colleague, a new storage system was used and the tape library was only technically connected to the network with a "little leg". I suspect this is the problem.
Can I also activate the "Solid Stade" manually?

regards

Chris

We’ve succeded the problem, it was an network connect problem. Now it run.

Thanks for the update, @MNCHR !