From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Mon, 7 Oct 2002 18:39:49 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Mon, 7 Oct 2002 18:39:49 -0400 Received: from tonnant.concentric.net ([207.155.248.72]:14261 "EHLO tonnant.cnchost.com") by vger.kernel.org with ESMTP id ; Mon, 7 Oct 2002 18:39:48 -0400 From: "Stuart Inglis" To: Subject: Floppy Raid Date: Tue, 8 Oct 2002 11:45:14 +1300 Message-ID: <002101c26e53$37df09a0$2a01410a@nz.reeltwo.com> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit X-Priority: 3 (Normal) X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook, Build 10.0.4024 Importance: Normal 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 Hi all, I've been playing with RAID over floppy (2x3.5" /dev/fd0, /dev/fd1) and have a few questions. (With 2.4.18) It seems clear that you can only read/write to one floppy device at a time. Is this a hardware limit or a linux limit? fdformat to a single drive takes around 100 seconds, whereas running two fdformats in parallel takes close to 400 seconds (2.4.18). It looks like this is because the lock changes when the fdformat switches from writing to verifying. While I have /dev/md0 setup with RAID-1 over fd0 and fd1, fdformat /dev/fd0 fails nicely with "Device or resource busy". But I can still mount /mnt/floppy and write to it... The changes appear on the /mnt/floppy but not /dev/md0 until I unmount /mnt/floppy. Should this be allowed to happen? Cheers Stuart