[5144] in linux-scsi channel archive
Re: Tekram DC-390
daemon@ATHENA.MIT.EDU (Kurt Garloff)
Sun Nov 15 21:58:49 1998
Date: Sun, 15 Nov 1998 23:09:25 +0100
From: Kurt Garloff <garloff@kg1.ping.de>
To: Robert Johannes <rjohanne@piper.hamline.edu>,
linux-scsi <linux-scsi@vger.rutgers.edu>
Mail-Followup-To: Robert Johannes <rjohanne@piper.hamline.edu>,
linux-scsi <linux-scsi@vger.rutgers.edu>
In-Reply-To: <Pine.LNX.3.96.981114153241.671B-100000@okurut.agule.net>; from Robert Johannes on Sat, Nov 14, 1998 at 03:49:15PM -0600
On Sat, Nov 14, 1998 at 03:49:15PM -0600, Robert Johannes wrote:
> I've the above card which has two internal connectors, one wide and the
> other narrow. I consequently have two drives, one wide and one narrow,
> which I'm trying to run off of the two connectors. I have a wide cable
> for the wide drive, and a narrow cable for the narrow drive.
>
> The problems is that when I connect both drives to the respective
> connectors, the scsi-controller bios does not detect any of them, and
> proceeds on to say, for each id (0-15), "unexpected disconnect: try to
> disable wide negotiation or sync negotiation for this device"
>
> I've tried disabling that as the message says, but with no success. What
> am I doing wrong?
You have the DC390F or DC390W, I guess. It has 3 connectors: Two internal
and one external.
Now, when cabling SCSI devices, they have to be in a linear chain with both
ends terminated.
Consequently, you are only allowed to use two of the three connectors.
Another consequence is that with your setup, both devices have to be
terminated. (If the SCSI controller is at one end, things are sometimes
easier: It detects this situation and auto-terminates its end. (The other
end still has to be terminated with a jumper.) This may also cause trouble
sometimes, cf. messages of the aic7xxx driver.)
Another source of trouble can be that your devices have the same SCSI ID. A
lot of devices are shipped with jumpers setting the ID to 6 (or to zero on
harddisks, sometimes). If two devices try to share the same SCSI ID, your
adapter won't be able to talk to one of them.
Hope this helps ...
--
Kurt Garloff <K.Garloff@ping.de> (Dortmund, FRG)
PGP key on http://student.physik.uni-dortmund.de/homepages/garloff
Unix IS user friendly - it's just selective about who its friends are!
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