If you chose the TS3500 (or P3000) during the creation of the library and your backup application does not support that library model type as a virtual tape system, the Set library type window allows you to change the library type to V-TS3500 (or VTF). Conversely, if you chose the V-TS3500 (or VTF) during library creation, and your backup application supports the TS3500 library, use Set library type to change the library type. (You can interchange between the TS3500 and V-TS3500 library models and between the P3000 and VTF library models.)
To set the library type: