From owner-freebsd-stable@FreeBSD.ORG  Mon Jun 27 03:15:18 2005
Return-Path: <owner-freebsd-stable@FreeBSD.ORG>
X-Original-To: freebsd-stable@freebsd.org
Delivered-To: freebsd-stable@freebsd.org
Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125])
	by hub.freebsd.org (Postfix) with ESMTP id 5B35916A41C
	for <freebsd-stable@freebsd.org>; Mon, 27 Jun 2005 03:15:18 +0000 (GMT)
	(envelope-from dmagda@ee.ryerson.ca)
Received: from tomts20-srv.bellnexxia.net (tomts20.bellnexxia.net
	[209.226.175.74])
	by mx1.FreeBSD.org (Postfix) with ESMTP id DEBB343D58
	for <freebsd-stable@freebsd.org>; Mon, 27 Jun 2005 03:15:17 +0000 (GMT)
	(envelope-from dmagda@ee.ryerson.ca)
Received: from [192.168.1.133] ([65.95.108.6]) by tomts20-srv.bellnexxia.net
	(InterMail vM.5.01.06.10 201-253-122-130-110-20040306) with ESMTP id
	<20050627031516.DRWM19894.tomts20-srv.bellnexxia.net@[192.168.1.133]>;
	Sun, 26 Jun 2005 23:15:16 -0400
In-Reply-To: <20050626233114.G57847@ganymede.hub.org>
References: <20050626233114.G57847@ganymede.hub.org>
Mime-Version: 1.0 (Apple Message framework v622)
Content-Type: text/plain; charset=US-ASCII; format=flowed
Message-Id: <3281130fd3a587b4a88a627ae305cb86@ee.ryerson.ca>
Content-Transfer-Encoding: 7bit
From: David Magda <dmagda@ee.ryerson.ca>
Date: Sun, 26 Jun 2005 23:15:20 -0400
To: "Marc G. Fournier" <scrappy@hub.org>
X-Mailer: Apple Mail (2.622)
Cc: freebsd-stable@freebsd.org
Subject: Re: SATA vs SCSI ...
X-BeenThere: freebsd-stable@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
Reply-To: David Magda <dmagda@ee.ryerson.ca>
List-Id: Production branch of FreeBSD source code <freebsd-stable.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-stable>, 
	<mailto:freebsd-stable-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-stable>
List-Post: <mailto:freebsd-stable@freebsd.org>
List-Help: <mailto:freebsd-stable-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-stable>,
	<mailto:freebsd-stable-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Mon, 27 Jun 2005 03:15:18 -0000


On Jun 26, 2005, at 22:34, Marc G. Fournier wrote:

> In fact, looking at the SATA 2.x specs, each chanell there is rated at 
> 300MB/s, which, again, if I could 'max out evenly', could seriously 
> blow away the SCSI bus itself ...
>
> *If* I'm reading this right ... ?

Bus speed does not equal drive speed. And while yes, SATA is now 
approaching SCSI in bus speed, it doesn't mean that SCSI isn't standing 
still. A 640 MB/s bus was standardized in 2003 (though SATA is planned 
to go to 600MB/s in 2007):

	http://en.wikipedia.org/wiki/SCSI#Ultra-640

This has been hashed out many times over the years in comp.periph.scsi 
(it used to be IDE versus SCSI, not it's (S)ATA versus SCSI). A search 
through the archives would probably return many results.

The SCSI FAQ [1] would also probably be useful. Specifically the 
questions:

QUESTION: What are the pros and cons regarding SCSI vs IDE/ATA ?
	http://home.comcast.net/~SCSIguy/SCSI_FAQ/scsifaq.html#_Hlk407004722

QUESTION:Should I spend the extra money on SCSI or just get IDE?
	http://home.comcast.net/~SCSIguy/SCSI_FAQ/scsifaq.html#_Hlk407091459

QUESTION:Why do SCSI disks cost so much more than IDE/ATA disks?
	http://home.comcast.net/~SCSIguy/SCSI_FAQ/scsifaq.html#_SCSI_Cost002

[1] http://www.scsifaq.org/