>Ok, "fast wide" - did they say something about "differential" vs.
Quantum confirmed that it was definately FW/Diff by the part number. The
case has 68 pins. I did open up the case in order to get the quantum part
number and all that is in there is a power cable leading to the drive and
two cables that lead to the drive jumpers. I check of those cables with the
case vendor indicated that they were properly configured.
>Did you open the case ? Is there anything between the socket for
>the SCSI cable and the drive itself that might change the SCSI
>transfer ? AFAIK, there are units to convert wide/narrow or
>diff/single - such a thing might be in the box.
No converters. Fairly standard stuff just jumper and power.
>> ((...)) It was pointed out in another post the fact
>> that I only tested SCSI ID's 0-6 when, as a differential device, I have a
>> lot more ID's available to me. Well, the case I have only goes 0-7
>> (suspicious isn't it).
>I assume you meant "wide" two lines above ? "Differential" does
>not influence the addresses available.
>> ((...)) I have
>> internal FWD SCSI drives hooked to that same bus/card and they work fine.
>In your first posting, you claimed "I have no other
>devices attached to this bus (at least as far as I can tell.)."
>which definitely differs from the new statement.
True, I have slowyly been improving my education. Upon re-examination of
the devices on the system, I realized that several hard drives that were
internal were attached to that card. My thinking, at the time, was very
narrow. I thought, there must not be any devices attached since there
aren't any other external devices. It never occured to me (it should have)
that they would have attached devices internally. Those devices seem to work
fine since they are all hard disks and show up on the system. One thing to
now. I get lots and lots of termination errors and SCSI error message in
the lot (doesn't matter if this DLT is attached or not. I still get them).
My guess is that there is something going on with the internal cables or
termination setup. I am going to remove the covers this week-end and try to
look at the cables to see if any are loose etc.
> I once had problems with a DLT 4000 (narrow, single-ended) which
>did not work as an external drive, even produce SCSI bus errors
>_until_ I moved it from the end of the SCSI chain to the beginning
>(the AIX box is a model 25T), so that drive definitely had its
>very special requirements. It was the distance from host adapter to
>drive along the bus, not the total bus length.
>I trust you have checked the termination of the bus ?
>Remember there are some claims of RS/6k to need "fast perfect
>termination" ("FPT"), not just "active" (or simply "passive").
>Joerg Bruehe, SQL Datenbanksysteme GmbH, Berlin, Germany
> (speaking only for himself)
FPT could be an issue. Currently I have a FW Diff card that has two MD 68
ports (externally) and neither port has a terminator. In high-end Sun
workstations you have to terminate the bus at the external connection point
EVEN IF there are no devices attached to the adapter card. I was wondering
if that was what was wrong here. I get lots of vscsi0 and vscsi1 errors in
the error log about "termination" "loose cable" etc. I was thinking that I
needed to have both of those external connections on this AIX box terminated
with active terminators. I have one terminator (currently on the DLT drive)
and I have ordered the second. When It comes in I plan to terminate both
external connections and watch to see if the errors go away.