From mboxrd@z Thu Jan 1 00:00:00 1970 From: "Stefan G. Weichinger" Subject: emergency call for help: raid5 fallen apart Date: Wed, 24 Feb 2010 15:54:47 +0100 Message-ID: <4B853DB7.1060406@xunil.at> Reply-To: lists@xunil.at Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Return-path: Sender: linux-raid-owner@vger.kernel.org To: linux-raid@vger.kernel.org List-Id: linux-raid.ids Sorry for maybe FAQing, I am in emergency mode: customer server, RAID5 + hotspare, 4 drives ... gentoo Linux version 2.6.25-gentoo-r7 mdadm 2.6.4-r1 here - one of the 4 drives showed massive errors in dmesg, /dev/sdc SMART-errors etc. bought new drive and wanted to swap today. # cat /proc/mdstat Personalities : [raid0] [raid1] [raid6] [raid5] [raid4] md1 : active raid1 sdb1[1] sda1[0] 104320 blocks [2/2] [UU] md3 : active raid5 sdb3[1] sda3[0] 19550976 blocks level 5, 64k chunk, algorithm 2 [3/2] [UU_] md4 : inactive sdb4[1](S) sdd4[3](S) sdc4[2](S) sda4[0](S) 583641088 blocks - I did: mdadm /dev/md3 --fail /dev/sdc3 went OK mdadm /dev/md4 --remove /dev/sdc3 OK as well, raid md3 rebuilt - With md4 I was too aggressive maybe: mdadm /dev/md4 --fail /dev/sdc4 --remove /dev/sdc4 this rendered md4 unusable, even after a reboot it can't be reassambled. This is bad, to say the least. md4 : inactive sdb4[1](S) sdd4[3](S) sdc4[2](S) sda4[0](S) 583641088 blocks What to try? This is a crucial server and I feel a lot of pressure. Rebuilding that raid would mean a lot of restore-work etc. So I would really appreciate a goo advice here. THANKS! Stefan