Boy have I seen this! Bottom line is that the Ultrix CAM driver is much
much more robust than NetBSD's SCSI driver. I have a DS5000/120 with
2 internal rz25's and an external Seagate. It took months until I was
able to boot NetBSD with the external drive on. What I needed to do was
buy:

1. Top of the line SCSI cabling to put into the DS5000
2. Top of the line SCSI cable to connect DS5000 to the expansion box
3. Top of the line SCSI cabling for the expansion box
4. Active SCSI terminator.

Making the Seagate spin-up when it firsts gets a SCSI command also seems
to help.

Some of the time the problem still occurs; however now that I also have
a tape drive connected to the external box and NetBSD seems to boot just
fine. I hope that this problem is dealt with in the next release.

yoseff


> When NetBSD tries old-style SCSI configuration (from Feb 6 kernel from
> stanford) it bombs after seeing rz0 with the following types of messages:
> asc: asc_intr: cmd 0 bn 0 cnt 0
> asc0 tgt 0 status 87 ss c1 ir 10 cond 10:710 msg 12 resid 0
> ... plus about 20 more lines of similar messages
> then the kernel pukes and I get a concole prom prompt.

> Like I said, if I remove the external scsi devices, no problem. Is this
> a known problem? I can boot ultrix just fine with the external drives
> on and dont get any scsi complaints. A test scsi from the console comes
> back clean too. Have I given enough information?

> Any ideas here? Thanks :)