"Power cycled the unit" ? Did you reboot? Else run "cfgmgr" and check with "lsdev -Cctape" which might bring something like:
Code:
root@srdbhv02:/> lsdev -Cctape
rmt0 Available 10-18-00-5,0 Bull 20/40 GB 4mm Tape Drive
rmt1 Available 20-48-00-4,0 Other SCSI Tape Drive