From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.2 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 28D61C433E0 for ; Sun, 28 Mar 2021 02:19:13 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id F0DEC61950 for ; Sun, 28 Mar 2021 02:19:12 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231339AbhC1CSk (ORCPT ); Sat, 27 Mar 2021 22:18:40 -0400 Received: from u17383850.onlinehome-server.com ([74.208.250.170]:54975 "EHLO u17383850.onlinehome-server.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231167AbhC1CSO (ORCPT ); Sat, 27 Mar 2021 22:18:14 -0400 X-Greylist: delayed 359 seconds by postgrey-1.27 at vger.kernel.org; Sat, 27 Mar 2021 22:18:14 EDT Received: by u17383850.onlinehome-server.com (Postfix, from userid 5001) id 4B823794; Sat, 27 Mar 2021 22:12:10 -0400 (EDT) Date: Sat, 27 Mar 2021 22:12:10 -0400 From: David T-G To: Linux RAID list Subject: how do i bring this disk back into the fold? Message-ID: <20210328021210.GA1415@justpickone.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.5.21 (2010-09-15) Precedence: bulk List-ID: X-Mailing-List: linux-raid@vger.kernel.org Hi, all -- I recently migrated our disk farm to a new server (see the next email), and I see that one of the partitions in a RAID5 set it inactive: diskfarm:~ # cat /proc/mdstat Personalities : [raid6] [raid5] [raid4] md127 : inactive sdf2[1](S) sdl2[0](S) sdj2[3](S) 2196934199 blocks super 1.2 md0 : active raid5 sdc1[3] sdd1[4] sdb1[0] 11720265216 blocks super 1.2 level 5, 512k chunk, algorithm 2 [4/3] [U_UU] diskfarm:~ # mdadm --examine /dev/sd[bcde]1 | egrep '/dev|Name|Role|State|Checksum|Events|UUID' /dev/sdb1: Array UUID : ca7008ef:90693dae:6c231ad7:08b3f92d Name : diskfarm:0 (local to host diskfarm) State : clean Device UUID : bbcf5aff:e4a928b8:4fd788c2:c3f298da Checksum : 4aa669d5 - correct Events : 77944 Device Role : Active device 0 Array State : A.AA ('A' == active, '.' == missing, 'R' == replacing) /dev/sdc1: Array UUID : ca7008ef:90693dae:6c231ad7:08b3f92d Name : diskfarm:0 (local to host diskfarm) State : clean Device UUID : c0a32425:2d206e98:78f9c264:d39e9720 Checksum : 38ee846d - correct Events : 77944 Device Role : Active device 2 Array State : A.AA ('A' == active, '.' == missing, 'R' == replacing) /dev/sdd1: Array UUID : ca7008ef:90693dae:6c231ad7:08b3f92d Name : diskfarm:0 (local to host diskfarm) State : clean Device UUID : f05a143b:50c9b024:36714b9a:44b6a159 Checksum : 49b381d8 - correct Events : 77944 Device Role : Active device 3 Array State : A.AA ('A' == active, '.' == missing, 'R' == replacing) /dev/sde1: Array UUID : ca7008ef:90693dae:6c231ad7:08b3f92d Name : diskfarm:0 (local to host diskfarm) State : active Device UUID : 835389bd:c065c575:0b9f2357:9070a400 Checksum : 80e1b8c4 - correct Events : 60360 Device Role : Active device 1 Array State : AAAA ('A' == active, '.' == missing, 'R' == replacing) diskfarm:~ # mdadm --detail /dev/md0 /dev/md0: Version : 1.2 Creation Time : Mon Feb 6 05:56:35 2017 Raid Level : raid5 Array Size : 11720265216 (10.92 TiB 12.00 TB) Used Dev Size : 3906755072 (3.64 TiB 4.00 TB) Raid Devices : 4 Total Devices : 3 Persistence : Superblock is persistent Update Time : Sun Mar 28 01:44:43 2021 State : clean, degraded Active Devices : 3 Working Devices : 3 Failed Devices : 0 Spare Devices : 0 Layout : left-symmetric Chunk Size : 512K Consistency Policy : resync Name : diskfarm:0 (local to host diskfarm) UUID : ca7008ef:90693dae:6c231ad7:08b3f92d Events : 77944 Number Major Minor RaidDevice State 0 8 17 0 active sync /dev/sdb1 - 0 0 1 removed 3 8 33 2 active sync /dev/sdc1 4 8 49 3 active sync /dev/sdd1 Before I go too crazy ... What do I need to do to bring sde1 back into the RAID volume, either to catch up the missing 17k events (probably preferred) or just to rebuild it? TIA & HANN :-D -- David T-G See http://justpickone.org/davidtg/email/ See http://justpickone.org/davidtg/tofu.txt