Aha .. I think this is focusing..
Post by Steve Wendt
I'm also unaware of any problems with the ordinary 2940 series of
cards other than the fact that they only run at 33MHz.
I tried using my 2940UW (which works very well on my Pentium II system)
on the same motherboard Mike referred to (i915GAV), and quickly had
problems. I can't speak for the U2W.
Exactly the same experience here Steve. But what I did to 'solve' it, back a
while ago at the time, was to go to the U2W cards, plus, make sure the Adaptec
BIOS on those U2W cards was at the latest revision level.
I've already given up on the 2940UW cards just as you noted above.
But there is more here, I think. Yes, the 29160 cards are working totally
stable as far as I can see on even the 320 level Seagate hard drives.
And .. for serious test purposes I've also just carried out some other research
here on a 915GAVL board with a U2W card in it. I've been able to complete
several complete SCSI DDS-3 4MM data cartridge backups on this box with no
errors with the U2W card. Now comes the interesting part.
I'd already replaced an earlier Adaptec card with the same 2940U2W version in a
Pentium II box with the same Seagate model SCSI DDS-3 4MM 23GB tape unit in it.
And I've even been having serious total system lockups red-light hard drive
type during total tape backups there. Curious, I looked at the SYSINFO 8.25
report on the driver profile on both it and the 915GAVL unit, which is giving
me no trouble with the U2W card there. AHA! There is a difference.
On the 915GAVL report, there are two additional functions showing in the
SYSINFO report for this card. They are "Memwrite+invalidate, System Errors",
which do *NOT* show up on the Pentium II system. As well, the 915GAVL data
shows a Cache Line Size of 64, which the Pentium II system shows a Cache Line
Size of 32.
Thinking about that, I chose to test the Pentium II box, for stability reasons,
with a command line instance of <cache /lazy:off> just after boot. I see
*MUCH* better stability in the Pentium II system with very, very heavy COM port
and IRQ use with that, together with very large data file writes on the HPFS
file partitions there with that change.
More important, testing the total backup to the SCSI DDS-3 4MM DAT drive on it
also finishes, as far as I can see, completely clean now with no lockups so
So .. with even MCP2 XRC05 and so on, it looks like maybe this is, in fact,
related to what you have posted, yet. The drive in this unit is also a level
320 Seagate unit.
As well, what is required now here, to perhaps really tell us what might be
important, courtesy of your post, is to slam a new 29160 card which I have into
this Pentium II box. Then do the tests for the whole stability and SCSI tape
backup without <cache /lazy:off>. That to see if we get out of the long SCSI
write snarls on it courtesy of the 29160 level card.
This takes hours of work at my level of use for this box. I'll get there in a
few days, hopefully. But I really need to know the right answer here, as may
be helpful to more than my doghouse around here, smile.
--> Sleep well; OS2's still awake! ;)