[1036] in linux-scsi channel archive
Re: Question.
daemon@ATHENA.MIT.EDU (Hartmut Niemann)
Thu Nov 28 02:49:57 1996
From: Hartmut Niemann <niemann@cip.e-technik.uni-erlangen.de>
To: jronan@edeleastar4.rtc-waterford.ie (John Ronan)
Date: Thu, 28 Nov 1996 08:46:15 +0100 (MEZ)
Cc: linux-scsi@vger.rutgers.edu (Linux SCSI)
In-Reply-To: <Pine.LNX.3.95.961127155816.15814A-100000@edeleastar4.rtc-waterford.ie> from "John Ronan" at Nov 27, 96 04:03:55 pm
>
> Howdy guys,
Hi John,
> I'm very new to SCSI stuff but I'm learning fast, I have a small,
> unimportant question for you experts out there.
> I have a ST42400N ( actuall I've 3 ) and there are no terminating
> resistors on the drive ( the sip slots are empty ). I chanced plugging it
> in to see does it work, it's the only drive on the bus, and it does work.
> Could someone tell me why?
Well, signals are reflected at ends of the bus that are not terminated properly.
So the signals and their echoes interfere and the signal quality gets worse.
It depends on many factors whether it gets bad enough to actually cause
immediate failure.
You are gambling here. Have fun!
> Also I intend mesing with raid0 stuff tomorrow when I get a cable. I have
> a scsi cdrom and conner drive on the internal bus and I'll be putting 2 of
> those beasts on the external bus. I know that I have to disable the
> terminating pack on the 1542, what way have I to configure the other
> devices on the bus.
The last device on each end of the bus has to be terminated.
That means that the last internal drive, which should be at the last connector
of the cable, and the last external one get terminated.
> Any info/comments much appreciated
> John
>
>
>
+--+
!cu!
+--+ Hartmut
--
Hartmut Niemann
niemann@cip.e-technik.uni-erlangen.de
Zum Aussichtsturm 18 D-91080 Marloffstein
