From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756495AbZKUQI6 (ORCPT ); Sat, 21 Nov 2009 11:08:58 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1754338AbZKUQI5 (ORCPT ); Sat, 21 Nov 2009 11:08:57 -0500 Received: from 82-117-125-11.tcdsl.calypso.net ([82.117.125.11]:58014 "EHLO smtp.ossman.eu" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754203AbZKUQI5 (ORCPT ); Sat, 21 Nov 2009 11:08:57 -0500 X-Greylist: delayed 304 seconds by postgrey-1.27 at vger.kernel.org; Sat, 21 Nov 2009 11:08:56 EST Date: Sat, 21 Nov 2009 17:03:55 +0100 From: Pierre Ossman To: neilb@suse.de Cc: LKML Subject: Re: Raid not shutting down when disks are lost? Message-ID: <20091121170355.7540d169@mjolnir.ossman.eu> In-Reply-To: <20091008163952.679572b5@mjolnir.ossman.eu> References: <20091008163952.679572b5@mjolnir.ossman.eu> X-Mailer: Claws Mail 3.7.3 (GTK+ 2.18.3; x86_64-redhat-linux-gnu) Mime-Version: 1.0 Content-Type: multipart/signed; micalg=PGP-SHA1; protocol="application/pgp-signature"; boundary="=_freyr.ossman.eu-10359-1258819440-0001-2" Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This is a MIME-formatted message. If you see this text it means that your E-mail software does not support MIME-formatted messages. --=_freyr.ossman.eu-10359-1258819440-0001-2 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: quoted-printable Neil? On Thu, 8 Oct 2009 16:39:52 +0200 Pierre Ossman wrote: > Today one RAID6 array I manage decided to lose four out of eight disks. > Oddly enough, the array did not shut down but instead I got > intermittent read and writer errors from the filesystem. >=20 > It's been some time since I had a failure of this magnitude, but I seem > to recall that once the array lost too many disks, it would shut down > and refuse to write a single byte. The nice effect of this was that if > it was a temporary error, you could just reboot and the array would > start nicely (albeit in degraded mode). >=20 > Has something changed? Is this perhaps an effect of using RAID6 (I used > to run RAID5 arrays)? Or was I simply lucky the previous instances I've > had? >=20 > Related, it would be nice if you could control how it handles lost > disks. E.g. I'd like it to go read-only when it goes in to fully > degraded mode. In case the last disk lost was only a temporary glitch, > the array could be made to recover without a lengthy resync. >=20 > Rgds --=20 -- Pierre Ossman WARNING: This correspondence is being monitored by FRA, a Swedish intelligence agency. Make sure your server uses encryption for SMTP traffic and consider using PGP for end-to-end encryption. --=_freyr.ossman.eu-10359-1258819440-0001-2 Content-Type: application/pgp-signature; name="signature.asc" Content-Transfer-Encoding: 7bit Content-Disposition: attachment; filename=signature.asc -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.13 (GNU/Linux) iEYEARECAAYFAksID20ACgkQ7b8eESbyJLiejACg05MdZwtSvLwMK5VXzpjo3HVD d54AoKypDo1/zObPHGAr/xxdqjuXSQcU =sDvu -----END PGP SIGNATURE----- --=_freyr.ossman.eu-10359-1258819440-0001-2--