From owner-freebsd-hardware@FreeBSD.ORG Wed Nov 16 07:20:08 2005 Return-Path: X-Original-To: hardware@freebsd.org Delivered-To: freebsd-hardware@FreeBSD.ORG Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id D2DD916A41F for ; Wed, 16 Nov 2005 07:20:08 +0000 (GMT) (envelope-from lehmann@ans-netz.de) Received: from avocado.salatschuessel.net (avocado.salatschuessel.net [83.136.81.184]) by mx1.FreeBSD.org (Postfix) with ESMTP id 9D6A743D64 for ; Wed, 16 Nov 2005 07:19:57 +0000 (GMT) (envelope-from lehmann@ans-netz.de) Received: (qmail 95051 invoked by uid 89); 16 Nov 2005 07:19:31 -0000 Received: from unknown (HELO kartoffel.salatschuessel.net) (83.136.81.185) by avocado.salatschuessel.net with SMTP; 16 Nov 2005 07:19:31 -0000 Date: Wed, 16 Nov 2005 08:19:59 +0100 From: Oliver Lehmann To: Mikhail Teterin Message-Id: <20051116081959.54462647.lehmann@ans-netz.de> In-Reply-To: <200511151754.16440.mi+mx@aldan.algebra.com> References: <200511151754.16440.mi+mx@aldan.algebra.com> X-Mailer: Sylpheed version 2.0.4 (GTK+ 2.8.6; amd64-portbld-freebsd6.0) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Cc: emoore@freebsd.org, hardware@freebsd.org Subject: Re: very poor performance of LSILogic's SATA 150-6D (RAID5) X-BeenThere: freebsd-hardware@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: General discussion of FreeBSD hardware List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 16 Nov 2005 07:20:08 -0000 Mikhail Teterin wrote: > Hello! > > We are observing very low performance of the 5- and 6-drive RAID5 array on the > LSILogic. > > For formal comparision we created two logical drives -- a 5-drive RAID5 and a > 1-drive RAID0. (All 6 disks are identical 200Gb Western Digital). > > According to iozone, the 5-drive RAID5 gets from 3 to 8 Mb/s. The 1-drive > RAID0 goes from 20 to 50Mb/s. > > Now, the controller has no battery and thus is not allowed to cache much, but > is the difference really supposed to be so great? It has 5 disks at its > disposal, after all... Hi, before i purchased my 3ware 9500S-4LP I tried an LSI 4port too and I experienced same bad results (which lead me to change it to 3ware). I was running it with 4 WD25000KS. a single disk: 6553600000 bytes transferred in 225.704693 secs (29036171 bytes/sec) (UP) RAID-0: 6553600000 bytes transferred in 204.397157 secs (32063068 bytes/sec) (UP) RAID-5 4194304000 bytes transferred in 146.751626 secs (28580971 bytes/sec) (UP) Notice that all results where takes with an uni-processor (UP) config even my system is SMP. Running the LSI wit SMP was _much_ slower (10MB/sec for RAID-5 iirc). -- Oliver Lehmann http://www.pofo.de/ http://wishlist.ans-netz.de/