[2220] in linux-scsi channel archive
Re: NCR 53C875
daemon@ATHENA.MIT.EDU (Pete Popov)
Thu Jul 31 16:28:44 1997
To: Myles Uyema <myles@puck.nether.net>
cc: linux-scsi@vger.rutgers.edu, Pete_Popov@asd.sel.sony.com
In-reply-to: Your message of "Thu, 31 Jul 1997 10:00:43 -1000."
<19970731100043.22690@uyema.nws.net>
Date: Thu, 31 Jul 1997 13:25:14 -0700
From: Pete Popov <pete@jones.asd.sel.sony.com>
>I'm shopping around for a decent but cheap SCSI controller.
>I happened to see an advertisement in Linux Journal by PromoX Systems.
>http://www.promox.com/
>They are selling an NCR 53C875 controller for $123.00 currently.
>I inquired about this, and the sales support replied that it was
>a SCSI-II card, INSTEAD of SCSI-III like Buslogic KT-958 or AHA2940UW.
>I'm confused here. The linux NCR drivers state this chipset can do
>Ultra-Wide, which I had thought to mean 'SCSI-III'... can someone clear
>this up?
Ultra Wide refers to the physical layer -- how fast can you
transfer data; SCSI 3 is the command specification -- how you
interpret the information after the physical layer has done it's
job in transporting the data. Most, if not all, SCSI 3 devices will
be SCSI 2 backward compatible. And, most devices on the market right
now are not SCSI 3.
Unless you absolutely need SCSI 3, don't worry about it. Go with an
adapter that's Ultra WIDE -- there are many WIDE disk drives out there,
so you can take advantage of the additional burst transfer rate.
Pete
