From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from columbia.partiallystapled.com ([199.38.182.105]:53086 "EHLO columbia.partiallystapled.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932108AbbDMOAS (ORCPT ); Mon, 13 Apr 2015 10:00:18 -0400 Received: from ganymede.homeslice (unknown [IPv6:2602:306:c413:8680:a189:b186:867f:5188]) (Authenticated sender: gxti) by columbia.partiallystapled.com (Postfix) with ESMTPSA id CCA8155F48 for ; Mon, 13 Apr 2015 09:51:11 -0400 (EDT) Message-ID: <552BC9CD.6090406@partiallystapled.com> Date: Mon, 13 Apr 2015 09:51:09 -0400 From: Michael Tharp MIME-Version: 1.0 To: linux-btrfs@vger.kernel.org Subject: Degraded volume silently fails to mount Content-Type: text/plain; charset=utf-8; format=flowed Sender: linux-btrfs-owner@vger.kernel.org List-ID: Hi list, I've got a 4 disk raid1 volume that has one failed disk. I have so far been unable to mount it in degraded mode, but the failure is that "mount" silently does nothing. # btrfs fi sh warning devid 2 not found already Label: 'seneca' uuid: b9da07f5-c0fd-45ad-861b-d1bcad6cbf4c Total devices 4 FS bytes used 581.71GiB devid 1 size 931.51GiB used 334.02GiB path /dev/mapper/luks-seneca-1 devid 3 size 931.51GiB used 334.01GiB path /dev/mapper/luks-seneca-3 devid 4 size 931.51GiB used 334.01GiB path /dev/mapper/luks-seneca-4 *** Some devices missing Btrfs v3.18.1 # mount -t btrfs -o degraded /dev/mapper/luks-seneca-1 /seneca # echo $? 0 # ls /seneca/ # grep seneca /proc/mounts # dmesg |tail [ 84.955467] BTRFS: device label seneca devid 1 transid 1753 /dev/dm-4 [ 87.926347] BTRFS: device label seneca devid 4 transid 1753 /dev/dm-5 [ 107.069109] BTRFS: device label seneca devid 3 transid 1753 /dev/dm-6 [ 195.267046] BTRFS info (device dm-6): allowing degraded mounts [ 195.267094] BTRFS info (device dm-6): disk space caching is enabled [ 195.267133] BTRFS: has skinny extents [ 195.277615] BTRFS warning (device dm-6): devid 2 missing [ 781.160250] BTRFS info (device dm-6): allowing degraded mounts [ 781.160270] BTRFS info (device dm-6): disk space caching is enabled [ 781.160286] BTRFS: has skinny extents # uname -a Linux ambrosia.homeslice 3.19.3-200.fc21.x86_64 #1 SMP Thu Mar 26 21:39:42 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux # btrfs --version Btrfs v3.18.1 Any ideas?