From owner-freebsd-chat Sat Dec 11 10:32:47 1999 Delivered-To: freebsd-chat@freebsd.org Received: from mail.enteract.com (mail.enteract.com [207.229.143.33]) by hub.freebsd.org (Postfix) with ESMTP id 3C9DE14F6B for ; Sat, 11 Dec 1999 10:32:45 -0800 (PST) (envelope-from dscheidt@enteract.com) Received: from shell-3.enteract.com (dscheidt@shell-3.enteract.com [207.229.143.42]) by mail.enteract.com (8.9.3/8.9.3) with SMTP id MAA95743; Sat, 11 Dec 1999 12:32:14 -0600 (CST) (envelope-from dscheidt@enteract.com) Date: Sat, 11 Dec 1999 12:32:14 -0600 (CST) From: David Scheidt To: Brett Glass Cc: Jay Nelson , Terry Lambert , chat@FreeBSD.ORG Subject: Re: dual 400 -> dual 600 worth it? In-Reply-To: <4.2.0.58.19991210230453.046806e0@localhost> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-freebsd-chat@FreeBSD.ORG Precedence: bulk X-Loop: FreeBSD.org On Fri, 10 Dec 1999, Brett Glass wrote: > At 10:45 PM 12/10/1999 , David Scheidt wrote: > > >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.) For the highest level of performance, you really must have each disk on its own IDE channel. I don't have much experience with machines with lots of IDE disks. The most I have worked with is 4 IDE disks, with two on the onboard controller and two on a PCI card controller. The machine didn't seem to do as many IO transactions per second as a similiar machine with 4 LVD SCSI disks. David To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-chat" in the body of the message