Subject: Re: narrow device connected to a wide scsi
From: Rich Peters (rpeters@micro-magic.com)
Date: Fri Nov 26 1999 - 08:29:15 AKST
----- Original Message -----
From: Rafael Noas <noas@mediasoft.cz>
To: <axp-list@redhat.com>
Sent: Friday, November 26, 1999 7:50 AM
Subject: RE: narrow device connected to a wide scsi
> what happens if I use one of this scsi-backplane connector that connect
> directly to the internal wide scsi cable, not at the end of the bus, and
> make one more external connector, then I can put there my tape without
> terminator. I'm right?
>
> internal wide bus
> |
> |
> +- hdd wide
> |
> +- 68->50pin bakplane convertor -- narrow Tape drive (not
> terminated)
> |
> +- hdd wide
> |
> # terminator
>
>
The SCSI Cable must be a single linear chain. You are putting a T in it,
and this wont work reliably.
The only way the 68-50 pin adapter should be used is to plug directly into
the back of a 50 pin drive,
as there is no T that way. I would recommend using an external 68 pin with
and external 68 pin terminator at the end of the chain. Place the tape
drive in between the teminator and the system, and remove its termination
and use that of the terminator. Use the 68-50 to plug directlry into the
back of the tape unit.
This applies if you are trying to run any ultra speeds on the 68 pin cable.
If you arent, you might be able to get away with a less than compliant
solution.
regards,
Rich
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