From owner-freebsd-hardware@FreeBSD.ORG Fri Oct 31 04:55:02 2008 Return-Path: Delivered-To: freebsd-hardware@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 1F36B1065670; Fri, 31 Oct 2008 04:55:02 +0000 (UTC) (envelope-from fbsd@dannysplace.net) Received: from mail.dannysplace.net (mail.dannysplace.net [213.133.54.210]) by mx1.freebsd.org (Postfix) with ESMTP id C56ED8FC1D; Fri, 31 Oct 2008 04:55:01 +0000 (UTC) (envelope-from fbsd@dannysplace.net) Received: from 203-206-171-212.perm.iinet.net.au ([203.206.171.212] helo=[192.168.10.10]) by mail.dannysplace.net with esmtpsa (TLSv1:AES256-SHA:256) (Exim 4.69 (FreeBSD)) (envelope-from ) id 1Kvm2F-000JZ2-9I; Fri, 31 Oct 2008 14:55:01 +1000 Message-ID: <490A8FAD.8060009@dannysplace.net> Date: Fri, 31 Oct 2008 14:55:09 +1000 From: Danny Carroll User-Agent: Thunderbird 2.0.0.17 (Windows/20080914) MIME-Version: 1.0 To: Jeremy Chadwick References: <490A782F.9060406@dannysplace.net> <20081031033208.GA21220@icarus.home.lan> <490A849C.7030009@dannysplace.net> <20081031043412.GA22289@icarus.home.lan> In-Reply-To: <20081031043412.GA22289@icarus.home.lan> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit X-Authenticated-User: danny X-Authenticator: plain X-Sender-Verify: SUCCEEDED (sender exists & accepts mail) X-Exim-Version: 4.69 (build at 08-Jul-2008 08:59:40) X-Date: 2008-10-31 14:54:59 X-Connected-IP: 203.206.171.212:1696 X-Message-Linecount: 31 X-Body-Linecount: 17 X-Message-Size: 1347 X-Body-Size: 676 X-Received-Count: 1 X-Recipient-Count: 3 X-Local-Recipient-Count: 3 X-Local-Recipient-Defer-Count: 0 X-Local-Recipient-Fail-Count: 0 X-SA-Exim-Connect-IP: 203.206.171.212 X-SA-Exim-Rcpt-To: koitsu@FreeBSD.org, freebsd-fs@freebsd.org, freebsd-hardware@freebsd.org X-SA-Exim-Mail-From: fbsd@dannysplace.net X-Spam-Checker-Version: SpamAssassin 3.2.5 (2008-06-10) on ferrari.dannysplace.net X-Spam-Level: X-Spam-Status: No, score=0.2 required=8.0 tests=ALL_TRUSTED,TVD_RCVD_IP autolearn=disabled version=3.2.5 X-SA-Exim-Version: 4.2 X-SA-Exim-Scanned: Yes (on mail.dannysplace.net) Cc: freebsd-fs@freebsd.org, freebsd-hardware@freebsd.org Subject: Re: Areca vs. ZFS performance testing. X-BeenThere: freebsd-hardware@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list Reply-To: fbsd@dannysplace.net List-Id: General discussion of FreeBSD hardware List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 31 Oct 2008 04:55:02 -0000 Jeremy Chadwick wrote: > > I'd like to see the performance difference between these scenarios: > > - Memory cache enabled on Areca, write caching enabled on disks > - Memory cache enabled on Areca, write caching disabled on disks > - Memory cache disabled on Areca, write caching enabled on disks > - Memory cache disabled on Areca, write caching disabled on disks > > I don't know if the controller will let you disable use of memory cache, > but I'm hoping it does. I'm pretty sure it lets you disable disk > write caching in its BIOS or via the CLI utility. The manual suggests that the write cache can be disabled. Perhaps there is no read cache for this card. -D