Status of tape connected to server got error while checking

We are using one new server in my small company. I bought one HP-ux server ps5300 series, as the server is running fine and I want to restore some old files in the server using one LT03 tape. When I used the command Mt –f /dev/rmt/0n stat it’s giving error as “/dev/rmt/0n: No such file or directory”. I tried ejecting the media also but I am getting same error. Can someone tell me how to find the mounting point in the server and how to rewind the tape drive.
