From mboxrd@z Thu Jan 1 00:00:00 1970 From: Andreas Klauer Subject: Re: Recover array after I panicked Date: Sun, 23 Apr 2017 12:46:06 +0200 Message-ID: <20170423104606.GA4603@metamorpher.de> References: <3957da08-6ff4-3c15-e499-157244a767aa@powerlamerz.org> <20170423101639.GA4471@metamorpher.de> <37269c2b-1788-a0b6-6d91-84c6b6bdd16c@powerlamerz.org> Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Transfer-Encoding: 8bit Return-path: Content-Disposition: inline In-Reply-To: <37269c2b-1788-a0b6-6d91-84c6b6bdd16c@powerlamerz.org> Sender: linux-raid-owner@vger.kernel.org To: Patrik =?iso-8859-1?Q?Dahlstr=F6m?= Cc: linux-raid@vger.kernel.org List-Id: linux-raid.ids On Sun, Apr 23, 2017 at 12:23:17PM +0200, Patrik Dahlström wrote: > At this point, it is incorrect. :-( > I've lost the output from the working > raid too, unless it's located in any log in /var/log/. If you have kernel logs from before your accident... check for stuff like this: [ 7.328420] md: md6 stopped. [ 7.329705] md/raid:md6: device sdb6 operational as raid disk 0 [ 7.329705] md/raid:md6: device sdg6 operational as raid disk 6 [ 7.329706] md/raid:md6: device sdh6 operational as raid disk 5 [ 7.329706] md/raid:md6: device sdf6 operational as raid disk 4 [ 7.329706] md/raid:md6: device sde6 operational as raid disk 3 [ 7.329707] md/raid:md6: device sdd6 operational as raid disk 2 [ 7.329707] md/raid:md6: device sdc6 operational as raid disk 1 [ 7.329924] md/raid:md6: raid level 5 active with 7 out of 7 devices, algorithm 2 [ 7.329936] md6: detected capacity change from 0 to 1500282617856 That's not everything but it's something. Also in the future for experiments, go with overlays. https://raid.wiki.kernel.org/index.php/Recovering_a_failed_software_RAID#Making_the_harddisks_read-only_using_an_overlay_file (and the overlay manipulation functions below that) Lets you mess with mdadm --create stuff w/o actually overwriting original metadata. Regards Andreas Klauer