It's a 4.2-R system. Here's the relevant part of the verbose boot
(without the new DDYS-T18350N because this makes the system hard to
use). The 68pin cable is about 60cm with 4 connectors every 20cm. The
active terminator was way expensive (DM50 = US$25). The 50pin cable is
150cm long, with 8 connectors spaced 1--------2-3-4-5-6-7-8, aic7880
being at position 1, the terminated IBM DCAS at position 8 and other
unterminated SCSI2 devices at 5 and 7.
The narrow cable is quite long. You might try distributing the
devices more evenly along the cable. This gives better transmission
line qualities. One other thing that might be affecting you is the
firmware version on the DDYS drive. S80D is really bad. The latest
is S96H.
(ahc0:A:3:0): Sending SDTR period 19, offset f
(ahc0:A:3:0): Received SDTR period 19, offset f
Filtered to period 19, offset f
...This repeats at 3Hz for a minute until this comes:
That's to be expected. Any time a check condition occurs without
a data transfer, we renegotiate.
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6 messages in org.freebsd.freebsd-scsiRe: Trouble with timeouts after insta...