From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S263512AbTDCUzM (for ); Thu, 3 Apr 2003 15:55:12 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S263513AbTDCUzM (for ); Thu, 3 Apr 2003 15:55:12 -0500 Received: from 205-158-62-136.outblaze.com ([205.158.62.136]:44737 "HELO fs5-4.us4.outblaze.com") by vger.kernel.org with SMTP id S263512AbTDCUzJ (for ); Thu, 3 Apr 2003 15:55:09 -0500 Subject: Re: RAID 5 performance problems From: Felipe Alfaro Solana To: Jonathan Vardy Cc: linux-raid@vger.kernel.org, LKML In-Reply-To: <73300040777B0F44B8CE29C87A0782E101FA97B2@exchange.explainerdc.com> References: <73300040777B0F44B8CE29C87A0782E101FA97B2@exchange.explainerdc.com> Content-Type: text/plain Organization: Message-Id: <1049403984.1175.2.camel@teapot.felipe-alfaro.com> Mime-Version: 1.0 X-Mailer: Ximian Evolution 1.2.3 (1.2.3-1) Date: 03 Apr 2003 23:06:24 +0200 Content-Transfer-Encoding: 7bit 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. ________________________________________________________________________ Linux Registered User #287198