From owner-freebsd-performance@FreeBSD.ORG Wed Sep 3 13:41:08 2003 Return-Path: Delivered-To: freebsd-performance@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id E50E316A4BF for ; Wed, 3 Sep 2003 13:41:08 -0700 (PDT) Received: from silver.he.iki.fi (helenius.fi [193.64.42.241]) by mx1.FreeBSD.org (Postfix) with ESMTP id AC00843FEA for ; Wed, 3 Sep 2003 13:41:07 -0700 (PDT) (envelope-from pete@he.iki.fi) Received: from he.iki.fi (h81.vuokselantie10.fi [193.64.42.129]) by silver.he.iki.fi (8.12.9/8.11.4) with ESMTP id h83Kew2k013685; Wed, 3 Sep 2003 23:40:59 +0300 (EEST) (envelope-from pete@he.iki.fi) Message-ID: <3F5651D9.1030701@he.iki.fi> Date: Wed, 03 Sep 2003 23:40:57 +0300 From: Petri Helenius User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.4) Gecko/20030624 X-Accept-Language: en-us, en MIME-Version: 1.0 To: Eric Anderson References: <64484.1062620915@critter.freebsd.dk> <3F564F70.1000905@centtech.com> In-Reply-To: <3F564F70.1000905@centtech.com> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 8bit cc: Poul-Henning Kamp cc: freebsd-performance@freebsd.org Subject: Re: 20TB Storage System X-BeenThere: freebsd-performance@freebsd.org X-Mailman-Version: 2.1.1 Precedence: list List-Id: Performance/tuning List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 03 Sep 2003 20:41:09 -0000 Eric Anderson wrote: > > So what's the appropriate way to calculate what blocksize and how many > inodes you should use? > I might be wrong but for specific applications you just know the block size based on what the application uses. For the rest, look for the average IO size on systat´s vmstat display. For inodes, see how many you have and do 2-4 times the number you think you need, they are little complicated to add afterwards. Pete