>ANR8302E I/O error on drive AIT09 (/dev/rmt/26mt) (OP=RSR, CC=205, KEY=FF,
>ASC=FF, ASC=FF, ASCQ=FF, SENSE=**NONE**, Description=SCSI adaptor failure).

Dave - Refer to the back of the Messages manual for their suggestions of
       what to check for Completion Code 205, which could be a loose
cable or a damaged cable.  Your posting didn't say if this just started
happening after a history of successful operation, but I'll assume that.
Make sure that no one has monkeyed with the SCSI chain, making it too
long, putting on the wrong type of terminator, ...
  Richard Sims, BU