From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Fri, 24 Aug 2001 16:24:11 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Fri, 24 Aug 2001 16:24:01 -0400 Received: from islay.mach.uni-karlsruhe.de ([129.13.162.92]:23462 "EHLO mailout.plan9.de") by vger.kernel.org with ESMTP id ; Fri, 24 Aug 2001 16:23:42 -0400 Date: Fri, 24 Aug 2001 22:23:50 +0200 From: To: Daryll Strauss Cc: Wilfried Weissmann , Kernel Mailing List Subject: Re: software raid does not do parallel reads under 2.4? Message-ID: <20010824222350.C12903@fuji.laendle> Mail-Followup-To: Daryll Strauss , Wilfried Weissmann , Kernel Mailing List In-Reply-To: <20010823234218.B12873@cerebro.laendle> <15238.11161.492557.264988@notabene.cse.unsw.edu.au> <3B868874.B89B04DE@gmx.at> <20010824101439.C1717@newbie> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: <20010824101439.C1717@newbie> X-Operating-System: Linux version 2.4.8-ac8 (root@cerebro) (gcc version 3.0.1) Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org On Fri, Aug 24, 2001 at 10:14:39AM -0700, Daryll Strauss wrote: > > There were a lot of ide reports some time ago. Maybe they where problems > > with concurrent I/O operations...? > > I'm seeing similar behavior with SCSI. I've got two SCSI channels. If I > run two dd's each talking to disks on different channels, I get 2x disk similar, but quite different: the difefrence is that i get full speed when accessing drives as /dev/hdx, but slow speed when doping the same opertaion using md. -- -----==- | ----==-- _ | ---==---(_)__ __ ____ __ Marc Lehmann +-- --==---/ / _ \/ // /\ \/ / pcg@goof.com |e| -=====/_/_//_/\_,_/ /_/\_\ XX11-RIPE --+ The choice of a GNU generation | |