From owner-freebsd-questions@FreeBSD.ORG  Fri Nov  4 21:26:36 2005
Return-Path: <owner-freebsd-questions@FreeBSD.ORG>
X-Original-To: freebsd-questions@freebsd.org
Delivered-To: freebsd-questions@freebsd.org
Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125])
	by hub.freebsd.org (Postfix) with ESMTP id CAB5216A41F
	for <freebsd-questions@freebsd.org>;
	Fri,  4 Nov 2005 21:26:36 +0000 (GMT)
	(envelope-from tedm@toybox.placo.com)
Received: from mail.freebsd-corp-net-guide.com (mail.web-strider.com
	[65.75.192.90]) by mx1.FreeBSD.org (Postfix) with ESMTP id 6278443D48
	for <freebsd-questions@freebsd.org>;
	Fri,  4 Nov 2005 21:26:36 +0000 (GMT)
	(envelope-from tedm@toybox.placo.com)
Received: from tedwin2k (nat-rtr.freebsd-corp-net-guide.com [65.75.197.130])
	by mail.freebsd-corp-net-guide.com (8.11.1/8.11.1) with SMTP id
	jA4LSsb60820; Fri, 4 Nov 2005 13:28:55 -0800 (PST)
	(envelope-from tedm@toybox.placo.com)
From: "Ted Mittelstaedt" <tedm@toybox.placo.com>
To: "Steve Bertrand" <iaccounts@ibctech.ca>, <gayn.winters@bristolsystems.com>,
	<freebsd-questions@freebsd.org>
Date: Fri, 4 Nov 2005 13:26:02 -0800
Message-ID: <LOBBIFDAGNMAMLGJJCKNEELIFCAA.tedm@toybox.placo.com>
MIME-Version: 1.0
Content-Type: text/plain;
	charset="Windows-1250"
Content-Transfer-Encoding: 7bit
X-Priority: 3 (Normal)
X-MSMail-Priority: Normal
X-Mailer: Microsoft Outlook IMO, Build 9.0.6604 (9.0.2911.0)
In-Reply-To: <20051103152751.C48FC43D49@mx1.FreeBSD.org>
X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1506
Importance: Normal
Cc: 
Subject: RE: gmirror on 1 or 2 IDE cables
X-BeenThere: freebsd-questions@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: User questions <freebsd-questions.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-questions>, 
	<mailto:freebsd-questions-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-questions>
List-Post: <mailto:freebsd-questions@freebsd.org>
List-Help: <mailto:freebsd-questions-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-questions>, 
	<mailto:freebsd-questions-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Fri, 04 Nov 2005 21:26:36 -0000



>-----Original Message-----
>From: owner-freebsd-questions@freebsd.org 
>[mailto:owner-freebsd-questions@freebsd.org]On Behalf Of Steve Bertrand
>Sent: Thursday, November 03, 2005 7:28 AM
>To: gayn.winters@bristolsystems.com; freebsd-questions@freebsd.org
>Subject: RE: gmirror on 1 or 2 IDE cables
>
>
>
>> Using gmirror to mirror two identical drives, how much of a 
>> performance hit is it to have
>> 
>> 1.  Both drives on one IDE cable?
>> Compared to:
>> 2.  One drive primary on one cable and one secondary on the 
>> other cable?
>> Compared to:
>> 3.  Both drives primary but on separate IDE cables?
>
>My understanding that only a single drive on each IDE channel can be
>accessed at any one time.
>

Which may or may not matter depending on what he's doing.  Are we
talking mainly reads or writes here?

Ted