From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S265435AbUABIQm (ORCPT ); Fri, 2 Jan 2004 03:16:42 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S265436AbUABIQm (ORCPT ); Fri, 2 Jan 2004 03:16:42 -0500 Received: from k-kdom.nishanet.com ([65.125.12.2]:51468 "EHLO mail2k.k-kdom.nishanet.com") by vger.kernel.org with ESMTP id S265435AbUABIQj (ORCPT ); Fri, 2 Jan 2004 03:16:39 -0500 Message-ID: <3FF5297E.6060802@nishanet.com> Date: Fri, 02 Jan 2004 03:19:10 -0500 From: Bob User-Agent: Mozilla Thunderbird 0.5a (20040102) X-Accept-Language: en-us, en MIME-Version: 1.0 To: kernel list Subject: Re: IDE-RAID Drive Performance References: <20031230122119.1566247a@Genbox> In-Reply-To: <20031230122119.1566247a@Genbox> Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Nuno Alexandre wrote: >On Tue, 30 Dec 2003 11:44:01 +0100 >Mr(s): Nicklas Bondesson wrote: > > > >>Hi! >> >>I think i'm getting really bad values from my disks. It's two Western >>Digital WD800JB-00DUA3 (Special Edition 8 MB cache) disks connected to a >>Promise TX2000 (PDC20271) card (RAID1 using ataraid under Linux 2.4.23). >> >>The disks are setup with hdparm at boot time: >> >>/sbin/hdparm -X69 -d1 -u1 -m16 -c3 /dev/hda >>/sbin/hdparm -X69 -d1 -u1 -m16 -c3 /dev/hdc >> >>When running hdparm -tT I get the following: >> >>/dev/hda: >> Timing buffer-cache reads: 128 MB in 1.13 seconds =113.27 MB/sec >> Timing buffered disk reads: 64 MB in 2.46 seconds = 26.02 MB/sec >> >>/dev/hdc: >> Timing buffer-cache reads: 128 MB in 1.13 seconds =113.27 MB/sec >> Timing buffered disk reads: 64 MB in 2.47 seconds = 25.91 MB/sec >> >>Are these normal values? I don't think so. Please advise. >> >>/Nicke >> >> > >Hi. >This is what i get with a Maxtor 6Y120L0 (2MB cache): > >/dev/hda: > Timing buffer-cache reads: 1320 MB in 2.00 seconds = 659.44 MB/sec > Timing buffered disk reads: 140 MB in 3.02 seconds = 46.40 MB/sec > >Using: >-d1 -u1 -m16 -c3 -W1 -A1 -k1 -X70 -a 8192 > >I'm not using raid, its a single disk connected to IDE1 on the motherboard. > >Maybe you can try those parameters and see if it helps :) > > I have two promise cards and four Maxtor DiamondMax Plus9 60G with 8MB cache each hdparm -d1 -u1 -m16 -c1 -W1 -A1 -k1 -X70 -a 8192 and my raid0 is software, linux, not the promise chip's raid on each drive I see 900 MB/s 47.2 MB/s and on /dev/md/2 /tmp with four drives four partitions I see 900 MB/s 94 MB/s that's with 64k raid chunk, reiser 4096b blocks Linux says 2048k raid chunk would minimize seek time for better real world performance. It doesn't work better with hdparm -tT but that's not realworld. My version of reiserfs doesn't allow changing the block size. -Bob D