Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S262239AbTIEFCA (ORCPT ); Fri, 5 Sep 2003 01:02:00 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S262244AbTIEFCA (ORCPT ); Fri, 5 Sep 2003 01:02:00 -0400 Received: from webhosting.rdsbv.ro ([213.157.185.164]:22246 "EHLO hosting.rdsbv.ro") by vger.kernel.org with ESMTP id S262239AbTIEFBd (ORCPT ); Fri, 5 Sep 2003 01:01:33 -0400 Date: Fri, 5 Sep 2003 08:01:31 +0300 (EEST) From: Catalin BOIE X-X-Sender: util@hosting.rdsbv.ro To: linux-raid@vger.kernel.org cc: linux-admin@vger.kernel.org, linux-kernel@vger.kernel.org, linux-ide@vger.kernel.org Subject: 2.4.22 + RAID 1 + SATA + 2 disks => no maximum speed Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 906 Lines: 36 Hi! I have a machine with 2 SATA disks on 2 separate buses. hdparm -t /dev/hda reports 50MB/s hdparm -t /dev/hdb reports 50MB/s I created a raid1 array with hda3 and hdc3, same partition sizes. If I do hdparm -t /dev/md0 it reports 50MB/s If I do cat /dev/md0 > /dev/null, vmstat reports 50MB/s If I start another cat /dev/md0 > /dev/null, in another console, I get 100MB/s from vmstat. Why I don't get 100MB/s on a single cat command? Some other test: cat /dev/hda3 > /dev/null& cat /dev/hdc3 > /dev/null& vmstat shows 100MB/s. Also, seems that writing is very slow (8MB/s). Any ideas? Thank you very much! --- Catalin(ux) BOIE catab@deuroconsult.ro - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/