Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id ; Wed, 13 Feb 2002 05:34:13 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id ; Wed, 13 Feb 2002 05:34:03 -0500 Received: from Morgoth.esiway.net ([193.194.16.157]:43022 "EHLO Morgoth.esiway.net") by vger.kernel.org with ESMTP id ; Wed, 13 Feb 2002 05:33:46 -0500 Date: Wed, 13 Feb 2002 11:33:43 +0100 (CET) From: Marco Colombo To: Alan Cox cc: linux-kernel@vger.kernel.org Subject: Re: Quick question on Software RAID support. In-Reply-To: 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 On Wed, 13 Feb 2002, Alan Cox wrote: > > 1) Does the Software RAID-5 support automatic detection > > of a drive failure? How? > > It sees the commands failing on the underlying controller. Set up a software ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ Is it supposed to detect a failed disk and *stop* using it? I had a raid1 IDE system, and it was continuosly raising hard errors on hdc (the disk was dead, non just some bad blocks): the net result was that it was unusable - too slow, too busy on IDE errors (a lot of them - even syslog wasn't happy). Ok, all it took me was to replace the disk, partition it and raidhotadd devices. Yet it needed manual intervention. I wish it performed an raidhotremove automagically so to run with decent performance... even if in "degraded mode". It was RH 2.2.19, so things may have changed meanwhile. BTW, given a 2 disks IDE raid1 setup (hda / hdc), does it pay to put a third disk in (say hdb) and configure it as "spare disk"? I've got concerns about the slave not actually beeing able to operate if the master (hda) fails badly. TIA, .TM. - 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/