Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S934633AbdCWQ6P (ORCPT ); Thu, 23 Mar 2017 12:58:15 -0400 Received: from box.mueller.org ([45.79.158.33]:42710 "EHLO mail.mueller.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S934320AbdCWQ6M (ORCPT ); Thu, 23 Mar 2017 12:58:12 -0400 X-Greylist: delayed 499 seconds by postgrey-1.27 at vger.kernel.org; Thu, 23 Mar 2017 12:58:12 EDT To: linux-kernel@vger.kernel.org From: raid@mueller.org Subject: RAID array is gone, please help Message-ID: Date: Thu, 23 Mar 2017 17:49:05 +0100 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:45.0) Gecko/20100101 Thunderbird/45.8.0 MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2144 Lines: 65 I am hoping someone here will help me. Was reading this site... https://raid.wiki.kernel.org/index.php/Linux_Raid and it said to email this list if you've tried everything other than mdadm --create. I am running Ubuntu 16.04. Machine name is fred. I used webmin to create a 4 disk RAID10 array yesterday. I moved all my data onto the array. Today, I had to reboot my PC. The resync was still not done, but I read online that it's OK to boot during resync. After boot, my array was gone. I checked syslog, and it just has this line: DeviceDisappeared event detected on md device /dev/md0 I did not partition my disks before building the array. So I believe the array consisted of /dev/sdc, /dev/sdd, /dev/sde, and /dev/sdf. Here's some info... stephen@fred> lsblk NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINT sda 8:0 0 117.4G 0 disk ├─sda1 8:1 0 109.7G 0 part / ├─sda2 8:2 0 1K 0 part └─sda5 8:5 0 7.7G 0 part [SWAP] sdb 8:16 0 465.8G 0 disk └─sdb1 8:17 0 465.8G 0 part sdc 8:32 0 3.7T 0 disk sdd 8:48 0 3.7T 0 disk sde 8:64 0 3.7T 0 disk sdf 8:80 0 3.7T 0 disk stephen@fred> sudo mdadm --examine /dev/sdc [sudo] password for stephen: /dev/sdc: MBR Magic : aa55 Partition[0] : 4294967295 sectors at 1 (type ee) stephen@fred> stephen@fred> sudo mdadm --examine /dev/sdc1 mdadm: cannot open /dev/sdc1: No such file or directory stephen@fred> stephen@fred> sudo mdadm --examine /dev/sdd /dev/sdd: MBR Magic : aa55 Partition[0] : 4294967295 sectors at 1 (type ee) stephen@fred> stephen@fred> sudo mdadm --examine /dev/sde /dev/sde: MBR Magic : aa55 Partition[0] : 4294967295 sectors at 1 (type ee) stephen@fred> stephen@fred> sudo mdadm --examine /dev/sdf /dev/sdf: MBR Magic : aa55 Partition[0] : 4294967295 sectors at 1 (type ee) stephen@fred> sudo mdadm --assemble --force /dev/md0 /dev/sdc /dev/sdd /dev/sde /dev/sdf mdadm: Cannot assemble mbr metadata on /dev/sdc mdadm: /dev/sdc has no superblock - assembly aborted Thank you for any help you can provide.