From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S263633AbTDCVCt (for ); Thu, 3 Apr 2003 16:02:49 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S263631AbTDCVCt (for ); Thu, 3 Apr 2003 16:02:49 -0500 Received: from amsfep14-int.chello.nl ([213.46.243.22]:59450 "EHLO amsfep14-int.chello.nl") by vger.kernel.org with ESMTP id S263629AbTDCVCq (for ); Thu, 3 Apr 2003 16:02:46 -0500 Message-ID: <005801c2fa25$f97d0810$2e77c23e@pentium4> From: "Jonathan Vardy" To: "Felipe Alfaro Solana" , "Jonathan Vardy" Cc: , "LKML" References: <73300040777B0F44B8CE29C87A0782E101FA97B2@exchange.explainerdc.com> <1049403984.1175.2.camel@teapot.felipe-alfaro.com> Subject: Re: RAID 5 performance problems Date: Thu, 3 Apr 2003 23:14:12 +0200 MIME-Version: 1.0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: 7bit X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2800.1106 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2800.1106 Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org > On Thu, 2003-04-03 at 17:45, Jonathan Vardy wrote: > > I'm having trouble with getting the right performance out of my software > > raid 5 system. I've installed Red Hat 9.0 with kernel 2.4.20 compiled > > myself to match my harware (had the same problem with the default > > kernel). When I test the raid device's speed using 'hdparm -Tt /dev/hdx' > > I get this: > > /dev/md0: > > Timing buffer-cache reads: 128 MB in 1.14 seconds =112.28 MB/sec > > Timing buffered disk reads: 64 MB in 2.39 seconds = 26.78 MB/sec > > Well, if I'm not wrong, you're testing physical, individual drives, not > the RAID5, combined, logical volume. So, your values are pretty normal. /dev/md0 is the raid device and as you can see from the bonny++ results in my original mail the, performance is not really normal.