Date: Mon, 13 Dec 1999 01:09:54 +0100 From: Martin Welk <mw@theatre.sax.de> To: John <papalia@UDel.Edu> Cc: mw@sax.de, David Bein <bein@pyramid.com>, freebsd-questions@FreeBSD.ORG Subject: Re: Adaptec/SCSI question ... Message-ID: <19991213010953.I59717@theatre.sax.de> In-Reply-To: <Pine.SOL.4.05.9912121836490.12806-100000@copland.udel.edu>; from papalia@UDel.Edu on Sun, Dec 12, 1999 at 06:39:05PM -0500 References: <19991212234352.B59717@theatre.sax.de> <Pine.SOL.4.05.9912121836490.12806-100000@copland.udel.edu>
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On Sun, Dec 12, 1999 at 06:39:05PM -0500, John wrote:
> If I'm understanding what you're saying though, the AHA2930U2W and the
> AHA2940U2W now allow you to support devices off of all connectors, as
> opposed to needing to keep a linear configuration? Just want to make sure
> I'm understanding fully.
That is what that AIC3660 SCSI bridge chip is doing. I don't know if the
AHA2940U2W has this chip on board, sorry, but the AHA2930U2W has it and
so I would expect it to do that job as this bridge does it on the P2B-S
motherboard. But to be true, I haven't read any ``genuine Adaptec
documentation'' promising that neither have I tried it yet. But as my
collegue said, it is possible to connect devices to each connector
(50 pin internal, 68 pin LVD internal, external ``high density''
connector) and to use them parallel. I don't know about termination,
in the P2B-S based box all individual three SCSI chains have proper
termination at the one end and the rest is done by the motherboard.
Neither I have checked the cable specifications - I don't know if each SCSI
chain can be seen as one individual SCSI chain with specification depending
on it's type or if there is something special.
As that 2930U2W was a bulk one, there was no documentation with it.
Regards,
Martin
--
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