From owner-freebsd-performance@FreeBSD.ORG Wed Sep 3 11:45:11 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 E562216A4BF for ; Wed, 3 Sep 2003 11:45:11 -0700 (PDT) Received: from alternator.sgh.waw.pl (alternator.sgh.waw.pl [194.145.96.100]) by mx1.FreeBSD.org (Postfix) with ESMTP id 8DB2D43FE5 for ; Wed, 3 Sep 2003 11:45:08 -0700 (PDT) (envelope-from chopin@sgh.waw.pl) Received: from localhost (localhost [127.0.0.1]) by alternator.sgh.waw.pl (Postfix) with SMTP id 80BD52AB100 for ; Wed, 3 Sep 2003 20:45:07 +0200 (CEST) Received: from akson.sgh.waw.pl (akson.sgh.waw.pl [194.145.96.12]) by alternator.sgh.waw.pl (Postfix) with ESMTP id 78B2A2AB0CC for ; Wed, 3 Sep 2003 20:45:07 +0200 (CEST) Received: by akson.sgh.waw.pl (Postfix, from userid 100) id 30FB775A7A; Wed, 3 Sep 2003 20:45:07 +0200 (MET DST) Date: Wed, 3 Sep 2003 20:45:07 +0200 From: Piotr KUCHARSKI To: freebsd-performance@freebsd.org Message-ID: <20030903184506.GC14797@sgh.waw.pl> Mail-Followup-To: Piotr KUCHARSKI , freebsd-performance@freebsd.org References: <3F5634FE.9080303@mac.com> Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-2 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <3F5634FE.9080303@mac.com> User-Agent: Mutt/1.4i Subject: Re: 20TB Storage System (fsck????) 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 18:45:12 -0000 On Wed, Sep 03, 2003 at 02:37:50PM -0400, Chuck Swiger wrote: > I'm wary of the write-performance hit from putting too many drives wide > in a RAID-5 (or -5,0) configuration. How many is "too many"? Or, rather, what are write-performance penalties when using sixteen disks in one hw raid5 set? (With two raid volumes, 2TB and 1.75TB available for OS.) p. -- Beware of he who would deny you access to information, for in his heart he dreams himself your master. -- Commissioner Pravin Lal http://nerdquiz.sgh.waw.pl/ -- polska wersja quizu dla nerdów ;)