From owner-freebsd-isp@FreeBSD.ORG Wed Oct 20 21:29:44 2004 Return-Path: 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 4BF8F16A4CE for ; Wed, 20 Oct 2004 21:29:44 +0000 (GMT) Received: from util.inch.com (mx.inch.com [216.223.198.27]) by mx1.FreeBSD.org (Postfix) with ESMTP id CD0C543D53 for ; Wed, 20 Oct 2004 21:29:43 +0000 (GMT) (envelope-from spork@inch.com) Received: from shell.inch.com (www.inch.com [216.223.192.20]) i9KLTal0088915; Wed, 20 Oct 2004 17:29:37 -0400 (EDT) (envelope-from spork@inch.com) Received: from shell.inch.com (localhost [127.0.0.1]) by shell.inch.com (8.12.8p2/8.12.8) with ESMTP id i9KLTaJS006462; Wed, 20 Oct 2004 17:29:36 -0400 (EDT) (envelope-from spork@inch.com) Received: from localhost (spork@localhost)i9KLTZl2006459; Wed, 20 Oct 2004 17:29:35 -0400 (EDT) X-Authentication-Warning: shell.inch.com: spork owned process doing -bs Date: Wed, 20 Oct 2004 17:29:35 -0400 (EDT) From: Charles Sprickman To: Kristofer Pettijohn In-Reply-To: <20041019192252.GB78974@cybernetik.net> Message-ID: <20041020172819.A2588@shell.inch.com> References: <20041019192252.GB78974@cybernetik.net> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII cc: freebsd-isp@freebsd.org 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 List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 20 Oct 2004 21:29:44 -0000 On Tue, 19 Oct 2004, Kristofer Pettijohn wrote: > I've used tunefs to set the average file size to 20 MB and enabled > soft-updates, as these are generally larger binary files that just > get appended to, and then seeked later on to send the article out, > I've played with setting the stripe size from anywhere between 8MB > and 64MB, and did not see much change on performance between those. It's been awhile since I played with ccd and news, but isn't there a stripe size setting when you configure ccd? Fiddling with that might be interesting. If the stripe is small and your files are big, I imagine performance would suffer. Charles > 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 > _______________________________________________ > freebsd-isp@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-isp > To unsubscribe, send any mail to "freebsd-isp-unsubscribe@freebsd.org" >