From owner-freebsd-performance@FreeBSD.ORG Tue Apr 22 04:24:25 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 A740537B401 for ; Tue, 22 Apr 2003 04:24:25 -0700 (PDT) Received: from mail.svenskabutiker.se (ns.svenskabutiker.se [212.247.101.67]) by mx1.FreeBSD.org (Postfix) with ESMTP id 6806543FEA for ; Tue, 22 Apr 2003 04:24:24 -0700 (PDT) (envelope-from martin@mullet.se) Received: from mullet.se (h118n1fls31o985.telia.com [213.65.16.118]) by mail.svenskabutiker.se (Postfix) with ESMTP id A3D221F02; Tue, 22 Apr 2003 13:24:21 +0200 (CEST) Message-ID: <3EA52696.1090308@mullet.se> Date: Tue, 22 Apr 2003 13:25:10 +0200 From: Martin Nilsson User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.0; en-US; rv:1.3) Gecko/20030312 X-Accept-Language: sv, en-us, en MIME-Version: 1.0 To: argo References: <1050669889.575.12.camel@station.purk.ee> In-Reply-To: <1050669889.575.12.camel@station.purk.ee> Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 8bit cc: freebsd-performance@freebsd.org Subject: Re: aic7892 trouble 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: Tue, 22 Apr 2003 11:24:25 -0000 argo wrote: > I have Adaptec U160 Host-Adapter with 2x Atlas 10k disks.When i copy > large files (~700MB) then performance is pretty bad.I got only about > 35MB/sec between those 2 disks. Only? The Atlas 10K3 disk have an outer STR of ~55MB/s and an inner STR of ~35MB/s. The STR is the rate at which you can read the same track over and over again. In normal use you will have to reposition the heads from tack to track and the disk doing the writing will probably not be as fast as the one reading. For an indepth analysis of the Atlas 10K3 see: http://www.storagereview.com/articles/200107/20010711KW073L8_1.html What your test shows is that FreeBSD is very efficient and it does not degrade performance in any way. If you want a faster STR you have to buy newer disks or use RAID1 (or RAID5). /Martin > Thanks in advance. > > ahc0: port 0xa000-0xa0ff mem > 0xe2024000-0xe2024fff irq 11 at device 9.0 on pci0 > aic7892: Ultra160 Wide Channel A, SCSI Id=7, 32/253 SCBs > > da0 at ahc0 bus 0 target 0 lun 0 > da0: Fixed Direct Access SCSI-3 device > da0: 160.000MB/s transfers (80.000MHz, offset 127, 16bit), Tagged -- Martin Nilsson, CTO & Founder, Mullet Scandinavia AB, Malmö, SWEDEN E-mail: martin@mullet.se, Phone: +46-(0)708-606170, http://www.mullet.se Our business is well engineered servers optimized for FreeBSD and Linux.