From owner-freebsd-isp@FreeBSD.ORG  Tue Oct 19 19:41:05 2004
Return-Path: <owner-freebsd-isp@FreeBSD.ORG>
Delivered-To: freebsd-isp@freebsd.org
Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125])
	by hub.freebsd.org (Postfix) with ESMTP id E82BF16A4CE
	for <freebsd-isp@freebsd.org>; Tue, 19 Oct 2004 19:41:05 +0000 (GMT)
Received: from sccmmhc91.asp.att.net (sccmmhc91.asp.att.net [204.127.203.211])
	by mx1.FreeBSD.org (Postfix) with ESMTP id 73CA943D5A
	for <freebsd-isp@freebsd.org>; Tue, 19 Oct 2004 19:41:05 +0000 (GMT)
	(envelope-from josh@tcbug.org)
Received: from [10.0.0.10] (12-218-40-24.client.mchsi.com[12.218.40.24])
          by sccmmhc91.asp.att.net (sccmmhc91) with ESMTP
          id <20041019194104m9100cddsqe>; Tue, 19 Oct 2004 19:41:05 +0000
From: Josh Paetzel <josh@tcbug.org>
To: freebsd-isp@freebsd.org
Date: Tue, 19 Oct 2004 14:40:24 +0000
User-Agent: KMail/1.7
References: <20041019192252.GB78974@cybernetik.net>
In-Reply-To: <20041019192252.GB78974@cybernetik.net>
MIME-Version: 1.0
Content-Type: text/plain;
  charset="iso-8859-1"
Content-Transfer-Encoding: 7bit
Content-Disposition: inline
Message-Id: <200410191440.24864.josh@tcbug.org>
cc: Kristofer Pettijohn <krishopper@cybernetik.net>
Subject: Re: Disk I/O Performance with CCD
X-BeenThere: freebsd-isp@freebsd.org
X-Mailman-Version: 2.1.1
Precedence: list
List-Id: Internet Services Providers <freebsd-isp.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-isp>,
	<mailto:freebsd-isp-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-isp>
List-Post: <mailto:freebsd-isp@freebsd.org>
List-Help: <mailto:freebsd-isp-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-isp>,
	<mailto:freebsd-isp-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Tue, 19 Oct 2004 19:41:06 -0000

On Tuesday 19 October 2004 19:22, Kristofer Pettijohn wrote:
> Im looking for some suggestions on I/O performance.
>
> I'm using FreeBSD 4.10-RELEASE on a Usenet transit server running
> Diablo for the transit software.
>
> I have 4 Seagate ST373435LC SCSI drives, 70GB each, and I am using
> CCD to bind them together with RAID-0 stripes.
>
> I can pull in anywhere from 30-40 MB sec and push out ~ 8-15
> MB/sec.. averaging about 50 MB/sec throughput.. feeds coming in are
> coming in just fine, but sending stuff back out is lagging behind..
> its falling about a half hour behind every hour.

> Maybe I'm just missing something small, but on these SCSI drives
> which have 160 MB/s transfer rates, I'm expecting a bit more than
> I'm getting with CCD.
>

> Can someone give me any pointers to look at or suggestions of
> things to try?
>
> Thanks!
>
> Kristofer

I don't know if this helps you out or not, but U160 drives have a 
160Meg/sec bus, not the ability to stream data at 160Megs/sec

Thanks,

Josh Paetzel