[5739] in linux-scsi channel archive
Re: Adaptec 2940UW controller driver for Linux
daemon@ATHENA.MIT.EDU (Doug Ledford)
Fri Jan 29 01:31:31 1999
Date: Fri, 29 Jan 1999 01:31:43 -0500
From: Doug Ledford <dledford@redhat.com>
To: "Allison, Bob" <BOB.allison@qwest.com>
Cc: "'doctor@fruitbat.org'" <doctor@fruitbat.org>,
linux-scsi@vger.rutgers.edu
"Allison, Bob" wrote:
>
> I'm not sure what you mean by the UW and U2W connectors. The U2W only had
> one 50-pin ribbon cable connector.
The 50 pin connector on a U2W is on the SE only bus segment (aka, behind
the 3860 chip). It is entirely possible that the 3860 could have been
bad.
> I believe that the last device on the
> chain is providing termination, but I don't know if it is active or passive;
> since these are SCSI-2 devices and not Ultras, I would assume that they
> don't know what active terminators are.
Active came about with SCSI-2 and was simply even more important when
Ultra started to appear. Devices capable of 10MByte/s narrow transfers
should use active termination, but if they have resistor packs for
termination, then it isn't active :)
> BTW, I sent the card back where it came from and got the 2944UW in its
> place, so I am running fine with my older FWD devices on the 2944 and my SE
> devices on the 2940. (I don't have any Ultra-SCSI devices.)
They way you said this, it almost sounds like you had the FWD on the
Ultra2 card. That does *not* work, the U2W card only supports SE and
LVD devices, not older HVD devices. That could have been a problem as
well.
--
Doug Ledford <dledford@redhat.com>
Opinions expressed are my own, but
they should be everybody's.
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