From owner-freebsd-chat Mon Dec 13 16:40:49 1999 Delivered-To: freebsd-chat@freebsd.org Received: from smtp02.primenet.com (smtp02.primenet.com [206.165.6.132]) by hub.freebsd.org (Postfix) with ESMTP id 60759151C6 for ; Mon, 13 Dec 1999 16:40:43 -0800 (PST) (envelope-from tlambert@usr08.primenet.com) Received: (from daemon@localhost) by smtp02.primenet.com (8.9.3/8.9.3) id RAA20960; Mon, 13 Dec 1999 17:40:29 -0700 (MST) Received: from usr08.primenet.com(206.165.6.208) via SMTP by smtp02.primenet.com, id smtpdAAAgGaWQO; Mon Dec 13 17:40:13 1999 Received: (from tlambert@localhost) by usr08.primenet.com (8.8.5/8.8.5) id RAA27620; Mon, 13 Dec 1999 17:40:16 -0700 (MST) From: Terry Lambert Message-Id: <199912140040.RAA27620@usr08.primenet.com> Subject: Re: dual 400 -> dual 600 worth it? To: brett@lariat.org (Brett Glass) Date: Tue, 14 Dec 1999 00:39:58 +0000 (GMT) Cc: dscheidt@enteract.com, noslenj@swbell.net, tlambert@primenet.com, chat@FreeBSD.ORG In-Reply-To: <4.2.0.58.19991210230453.046806e0@localhost> from "Brett Glass" at Dec 10, 99 11:06:47 pm X-Mailer: ELM [version 2.4 PL25] MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: owner-freebsd-chat@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org > >Under light to moderate IO loads, the disk interface isn't likely to be the > >overall limiting factor on the machine. You certainly save some money by > >going with IDE. On a low-end box, perhaps as much as 15 or 20% of the total > >cost of the machine. Once you move away from the bottom end, or you want > >more than a couple disks, SCSI looks much better. > > Why wouldn't IDE retain an advantage -- so long as you put the disks on > separate controllers to avoid having one block another? (I like > SCSI too, but given the realities -- or unrealities -- of hard drive > pricing I'm always looking to milk more performance out of IDE drives > when I can.) I will let you in on a "secret": SCSI drives cost more because that's what the market will bear, based on their performance characteristics relative to IDE. They cost the same to manufacture; it doesn't matter what mask you use to burn your 1 square inch ASIC. FWIW: IBM has demonstrated IDE hardware with tagged command queues, but is not manufacturing it (so far as I have been able to tell). The only other remaining thorn in IDE is the need to add more controllers after you have two disks installed; SCSI has it rather well beat there. Terry Lambert terry@lambert.org --- Any opinions in this posting are my own and not those of my present or previous employers. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-chat" in the body of the message