From owner-freebsd-questions@FreeBSD.ORG Fri Feb 27 15:24:34 2009 Return-Path: Delivered-To: freebsd-questions@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id F07F61065673 for ; Fri, 27 Feb 2009 15:24:34 +0000 (UTC) (envelope-from jcigar@ulb.ac.be) Received: from mxin.vub.ac.be (mxin.vub.ac.be [134.184.129.112]) by mx1.freebsd.org (Postfix) with ESMTP id 8CEEB8FC12 for ; Fri, 27 Feb 2009 15:24:34 +0000 (UTC) (envelope-from jcigar@ulb.ac.be) X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: AjMBAIiIp0mkD30E/2dsb2JhbAAI13GEFAY Received: from bebif01.ulb.ac.be (HELO [10.0.0.194]) ([164.15.125.4]) by smtp.vub.ac.be with ESMTP; 27 Feb 2009 15:54:57 +0100 From: Julien Cigar To: Wojciech Puchar In-Reply-To: References: <1235740489.2747.17.camel@frodon.be-bif.ulb.ac.be> Content-Type: text/plain; charset=utf-8 Date: Fri, 27 Feb 2009 15:56:36 +0100 Message-Id: <1235746596.2747.30.camel@frodon.be-bif.ulb.ac.be> Mime-Version: 1.0 X-Mailer: Evolution 2.22.3.1 Content-Transfer-Encoding: 8bit Cc: freebsd-questions@freebsd.org Subject: Re: poor performances with Intel Raid Controller (iir) X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 27 Feb 2009 15:24:35 -0000 On Fri, 2009-02-27 at 15:37 +0100, Wojciech Puchar wrote: > > > > I've a machine with an integrated Intel RAID controller (U320) which > > uses the iir driver. I have two arrays, one RAID 1 with two disks and > > one RAID 5 with 8 disks. The disks are all Seagate 320MB/s. The system > > is running FreeBSD 7.0-RELEASE with 8 processors (2,40 Ghz) and 4GB or > > RAM. > > > > I have very poor performances, around ~50 MB/s, is it normal ? > > > > jcigar@bccm-it ~ % dd if=/dev/zero of=blah bs=10M count=100 > > 100+0 records in > > 100+0 records out > > 1048576000 bytes transferred in 20.168689 secs (51990290 bytes/sec) > > > > Are there any tool to detect what could be the bottleneck(s) ? > > are you sure it isn't NORMAL performance of this card. > Not sure, I admit that the card is quite old (4 years), but 50 MB/s seems really slow to me (especially for U320 SCSI) .. > i think it is, the "hardware" RAID solutions are usually much slower than > software, even more with RAID5. I tend to use software RAID too (at least on system with multiple processors)... when I have choice. -- Julien Cigar Belgian Biodiversity Platform http://www.biodiversity.be Université Libre de Bruxelles (ULB) Campus de la Plaine CP 257 Bâtiment NO, Bureau 4 N4 115C (Niveau 4) Boulevard du Triomphe, entrée ULB 2 B-1050 Bruxelles Mail: jcigar@ulb.ac.be @biobel: http://biobel.biodiversity.be/person/show/471 Tel : 02 650 57 52