Problem was a loose cable!
The tape drive had been replaced last week and it was probably knocked loose then.   
The device files were there as rz24  (scsi 3 * 8) + ID 0.  scu and uerf couldn't see it because it wasn't there.  
Thank you for the responses!
Received on Fri Mar 02 2001 - 21:11:01 NZDT