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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id EBED1C7618D for ; Mon, 20 Mar 2023 14:36:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231207AbjCTOgs (ORCPT ); Mon, 20 Mar 2023 10:36:48 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39978 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231479AbjCTOgq (ORCPT ); Mon, 20 Mar 2023 10:36:46 -0400 Received: from mga14.intel.com (mga14.intel.com [192.55.52.115]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 015ED1A651 for ; Mon, 20 Mar 2023 07:36:45 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=intel.com; i=@intel.com; q=dns/txt; s=Intel; t=1679323006; x=1710859006; h=date:from:to:cc:subject:message-id:in-reply-to: references:mime-version:content-transfer-encoding; bh=9tAesx9HWsTeYikifKyBI077uBdWE88Wg18tFL6V9Kc=; b=kBfD1YhqBogHaYyhsrLkeWVEEtIEiZ5G1G3tZNz+F34nezhaS9EUpZv4 i24odNjAkjec2I07L1TNIDh0DFpyKVel4PRu6ZghX0kkViP07y6CPbTLp rAhl9es+IcNkruE8YvFrjhCFn5G3+F664Ne+OytswnXeUEdD6KTVzv9m8 DMpwzOSRXOLtbmy5LBI8/4B9xYBsjvBx32qbbebUaf6SYvMd6a/IlB+1t +i7kbsTkceiTwrgbd6Mrt2Gz+/aa53ofkDw9kcmzMl0kkWb44wIpl05UB N8we+0IOAPg3LPboV1RU1S3j7vcXxmFKctS8oUhdXL+Y6IrQLLSqS73us A==; X-IronPort-AV: E=McAfee;i="6600,9927,10655"; a="338702399" X-IronPort-AV: E=Sophos;i="5.98,274,1673942400"; d="scan'208";a="338702399" Received: from orsmga003.jf.intel.com ([10.7.209.27]) by fmsmga103.fm.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 20 Mar 2023 07:36:45 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=McAfee;i="6600,9927,10655"; a="631155006" X-IronPort-AV: E=Sophos;i="5.98,274,1673942400"; d="scan'208";a="631155006" Received: from mtkaczyk-mobl.ger.corp.intel.com (HELO localhost) ([10.237.142.82]) by orsmga003-auth.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 20 Mar 2023 07:36:44 -0700 Date: Mon, 20 Mar 2023 15:36:39 +0100 From: Mariusz Tkaczyk To: Marc MERLIN Cc: linux-raid@vger.kernel.org Subject: Re: mdadm --detail works, mdadm --stop says "does not appear to be an md device" Message-ID: <20230320153639.0000238d@linux.intel.com> In-Reply-To: <20230317173810.GW4049235@merlins.org> References: <20230317173810.GW4049235@merlins.org> X-Mailer: Claws Mail 4.1.0 (GTK 3.24.33; x86_64-w64-mingw32) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-raid@vger.kernel.org On Fri, 17 Mar 2023 10:38:10 -0700 Marc MERLIN wrote: > gargamel:~# cat /proc/mdstat > Personalities : [linear] [raid0] [raid1] [raid10] [raid6] [raid5] [raid4] > [multipath] md6 : active raid5 sdn1[3](F) sdt1[0](F) sds1[1](F) sdq1[2](F) > 23441547264 blocks super 1.2 level 5, 512k chunk, algorithm 2 [5/0] > [_____] gargamel:~# mdadm --stop /dev/md6 > mdadm: /dev/md6 does not appear to be an md device > gargamel:~# mdadm --detail /dev/md6 > /dev/md6: > Version : 1.2 > Creation Time : Wed Jul 8 10:09:21 2020 > Raid Level : raid5 > Array Size : 23441547264 (22355.60 GiB 24004.14 GB) > Used Dev Size : 5860386816 (5588.90 GiB 6001.04 GB) > Raid Devices : 5 > Total Devices : 4 > Persistence : Superblock is persistent > > Update Time : Fri Mar 17 09:17:28 2023 > State : clean, FAILED > Active Devices : 0 > Failed Devices : 4 > Spare Devices : 0 > > Layout : left-symmetric > Chunk Size : 512K > > Consistency Policy : ppl > > Number Major Minor RaidDevice State > - 0 0 0 removed > - 0 0 1 removed > - 0 0 2 removed > - 0 0 3 removed > - 0 0 4 removed > > > How do I clear this without a reboot? > > gargamel:~# uname -r > 5.19.7 > > Hi, mdadm is unable to complete this task because it cannot ensure that it is safe to stop the array. It cannot open the array with O_EXCL. If it is mounted then it may hang if filesystem needs to flush some data. Please, try umount the array if it mounted somewhere and then try: # echo inactive > /sys/block/md6/md/array_state # echo clear > /sys/block/md6/md/array_state Thanks, Mariusz