KB1816: Prevent Veeam from locking tape drives
https://www.veeam.com/kb181606.09.2013 · The registry keys below prevent Veeam Backup & Replication from scanning for changes to the tape systems that are attached to the server. If the tape drives/library are already showing up in the Veeam console under backup infrastructure, and you would like to remove them in addition to Veeam not scanning for them, you will have to follow the additional steps below.
KB1842: Tape library and drives are shown as separate devices
www.veeam.com › kb1842Dec 05, 2013 · Line 2: Connect to the Tape Server where the Tape Library and Drives are attached. Open an Administrative Command Prompt. Change directory to a temporary folder (e.g., cd C:\Temp\) Run the following command to dump information from the Veeam Tape Service. The command will complete silently, leaving in the folder a file named "dumpinformation.xml".
KB1842: Tape library and drives are shown ... - Veeam Software
https://www.veeam.com/kb184205.12.2013 · Line 2: Connect to the Tape Server where the Tape Library and Drives are attached. Open an Administrative Command Prompt. Change directory to a temporary folder (e.g., cd C:\Temp\) Run the following command to dump information from the Veeam Tape Service. The command will complete silently, leaving in the folder a file named "dumpinformation.xml".