st0 at scsibus0 targ 5 lun 0: <ARCHIVE, Python 25501-XXX, 2.66>
	  SCSI2 1/sequential removable
	st0: drive empty

  Note, I have the same problem now with:

st0 at scsibus0 targ 6 lun 0: <ARCHIVE, Python 28849-XXX, 4.CM> SCSI2 1/sequential removable
st0: density code 0x24, 512-byte blocks, write-enabled
ch0 at scsibus0 targ 6 lun 1: <ARCHIVE, Python 28849-XXX, 4.CM> SCSI2 8/changer removable
ch0: 4 slots, 1 drive, 1 picker, 0 portals

  giving me:
  
st0(ahc1:6:0): timed out in dataout phase, SCSISIGI == 0x0
st0(ahc1:6:0): BUS DEVICE RESET message queued.
Bus Device Reset Message Sent
st0(ahc1:6:0): Bus Device Reset delivered. 1 SCBs aborted
st0(ahc1:6:0):  Check Condition on CDB: 0x0a 00 01 00 00 00
    SENSE KEY:  Unit Attention
     ASC/ASCQ:  Power On, Reset, or Bus Device Reset Occurred

st0(ahc1:6:0):  Check Condition on CDB: 0x0a 00 01 00 00 00
    SENSE KEY:  Unit Attention
     ASC/ASCQ:  Power On, Reset, or Bus Device Reset Occurred

ahc1: target 6 synchronous at 5.0MHz, offset = 0xf
st0(ahc1:6:0): Target Busy
st0(ahc1:6:0): Target Busy
st0(ahc1:6:0): Target Busy
st0(ahc1:6:0): Target Busy
st0(ahc1:6:0): Target Busy
st0(ahc1:6:0): Target Busy
st0(ahc1:6:0): Target Busy
st0(ahc1:6:0): Target Busy
st0(ahc1:6:0): Target Busy
  
  To those who suggested that I needed better termination on my wide
bus to get 4 drives to work: you were right. I received a terminated cable
from Adaptec last week and I can now access my SCA drive. I'm going to
get a cable terminator for my narrow cable as well and see if this helps the
tape drive on it...

   :!mcr!:            |  Network and security consulting/contract programming
   Michael Richardson |         Firewalls, TCP/IP and Unix administration
 Personal: http://www.sandelman.ottawa.on.ca/People/Michael_Richardson/Bio.html
 Corporate: http://www.sandelman.ottawa.on.ca/SSW/
	ON HUMILITY: To err is human, to moo bovine.