Re: Ultra2

[Christopher Barry <cbarry@2xtreme.net>]

A lot of U2W disk drives can be jumpered to run in UW single ended mode, so that they
can be run on a 2940UW or a 2940U2W without the U2W connecter working yet. I should note
though that the cable that comes with U2W controllers (part # ACK-68I-U2W) uses a
differential terminator and cannot be used to connect U2W drives to a 2940UW or to the
UW connector on a 2940U2W and this is important because U2W drives being truly
differential, like SCA drives, come with no means to provide termination, which must be
provided by the cable. I've just had some email with Adaptec and Seagate about this
because I might buy a second generation Seagate Cheetah which is a lot faster than the
first generation Cheetah but is only available with U2W or better interfaces, and I see
no need to spend over $300 for a new motherboard or 2940U2W card when I'm very happy
with my 2940UW. So I'm ordering the U2W Cheetah and Adaptec's actively terminated UW
ribbon cable (ACK-W2W-5IT) and I'm set.

I only bothered to write this because if you already have a U2W controller you can run
U2W drives under Linux right now and you don't need to wait if you already possess or
purchase an actively terminated UW cable and if you are interested in running a U2W
drive without U2W SCSI you'll probably be able to so also without spending extra cash
for an interface that provides 3-4 times more bandwidth you'll ever need unless you have
a RAID.

Markus Lechner wrote:

> Hi Lawrence,
>
> I read on the kernel-list that the new boards run all except U2W - but
> they
> are working on it and it may soon be done. You can use the other
> SCSI-Parts up to UW-SCSI without any problems. You simply can't use the
> U2W-Part of your controller until they (the kernel and driver
> developers)
> get it done. I'm buying a new MB with U2W in a week, for example :)
>
> ok,
>
>         Mac
>
> Lawrence wrote:
> >
> > Does the current adaptec driver support Adaptec 2940U2W (Ultra2 Wide)
> > scsi card?
> >
> > Lawrence
> >
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