From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S263742AbTDDPAp (for ); Fri, 4 Apr 2003 10:00:45 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S263744AbTDDO7f (for ); Fri, 4 Apr 2003 09:59:35 -0500 Received: from mail.explainerdc.com ([212.72.36.220]:44455 "EHLO mail.explainerdc.com") by vger.kernel.org with ESMTP id S263741AbTDDOy2 convert rfc822-to-8bit (for ); Fri, 4 Apr 2003 09:54:28 -0500 X-MimeOLE: Produced By Microsoft Exchange V6.0.6249.0 content-class: urn:content-classes:message MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 8BIT Subject: RE: RAID 5 performance problems Date: Fri, 4 Apr 2003 17:05:56 +0200 Message-ID: <73300040777B0F44B8CE29C87A0782E101FA98E7@exchange.explainerdc.com> X-MS-Has-Attach: X-MS-TNEF-Correlator: Thread-Topic: RAID 5 performance problems Thread-Index: AcL6tiiQqMkAxRCQTlmMI0K2fApzvAABXr2g From: "Jonathan Vardy" To: "Ezra Nugroho" Cc: "Peter L. Ashford" , "Jonathan Vardy" , "Stephan van Hienen" , , Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org > From: Ezra Nugroho [mailto:ezran@goshen.edu] > Your hdc is still running at udma(33). This is also part of the raid, > right? This will slow the whole thing down since in raid 5 > write is done > to all disks simultaneously. Before the system finishes writing to the > slow drive, the write is not done yet. > Your hdc is still running at udma(33). This is also part of the raid, > right? This will slow the whole thing down since in raid 5 > write is done > to all disks simultaneously. Before the system finishes writing to the > slow drive, the write is not done yet. This should not cripple the performance to what I get. My friend had 6x80GB 5400rpm drives with two of those on udma33 and four on udma66 and he managed 80MB/sec (dual 500Mhz) Jonathan