From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S263615AbTDCUiT (for ); Thu, 3 Apr 2003 15:38:19 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S263616AbTDCUiS (for ); Thu, 3 Apr 2003 15:38:18 -0500 Received: from mail.goshen.edu ([199.8.232.22]:11137 "EHLO mail.goshen.edu") by vger.kernel.org with ESMTP id S263615AbTDCUiP (for ); Thu, 3 Apr 2003 15:38:15 -0500 Subject: Re: RAID 5 performance problems From: Ezra Nugroho To: linux-kernel@vger.kernel.org Cc: linux-raid@vger.kernel.org In-Reply-To: References: Content-Type: text/plain Content-Transfer-Encoding: 7bit X-Mailer: Ximian Evolution 1.0.8 (1.0.8-9.7x.1) Date: 03 Apr 2003 16:02:32 -0500 Message-Id: <1049403752.22426.5146.camel@ezran.goshen.edu> Mime-Version: 1.0 X-MailScanner-Information: Please contact the ISP for more information X-MailScanner: Found to be clean Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org > here benchmark from my system with an fasttrak-tx4 (same card jonathan > has) with WD1800BB : > > /dev/hde: > Timing buffer-cache reads: 128 MB in 0.28 seconds =457.14 MB/sec > Timing buffered disk reads: 64 MB in 1.37 seconds = 46.72 MB/sec > > WD1800BB on onboard ultra100 controller : > > /dev/hdo: > Timing buffer-cache reads: 128 MB in 0.28 seconds =457.14 MB/sec > Timing buffered disk reads: 64 MB in 1.58 seconds = 40.51 MB/sec > > WD1800BB on onboard ultra33 controller : > > /dev/hda: > Timing buffer-cache reads: 128 MB in 0.28 seconds =457.14 MB/sec > Timing buffered disk reads: 64 MB in 2.55 seconds = 25.10 MB/sec What should I expect from a 8 drive raid 5 on 3ware 7500-8? I get only /dev/sda: Timing buffer-cache reads: 128 MB in 0.74 seconds =172.97 MB/sec Timing buffered disk reads: 64 MB in 1.55 seconds = 41.29 MB/sec which seems to be slow compared to the numbers above