From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-wm0-f52.google.com ([74.125.82.52]:37544 "EHLO mail-wm0-f52.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750713AbcGDTL2 (ORCPT ); Mon, 4 Jul 2016 15:11:28 -0400 Received: by mail-wm0-f52.google.com with SMTP id a66so126242558wme.0 for ; Mon, 04 Jul 2016 12:11:28 -0700 (PDT) Subject: Re: Unable to mount degraded RAID5 To: Chris Murphy , Btrfs BTRFS References: <95f58623-95a4-b5d2-fa3a-bfb957840a31@gmail.com> From: =?UTF-8?B?VG9tw6HFoSBIcmRpbmE=?= Message-ID: Date: Mon, 4 Jul 2016 21:11:27 +0200 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset=utf-8 Sender: linux-btrfs-owner@vger.kernel.org List-ID: Result from dmesg: http://sebsauvage.net/paste/?4e8e95b5eafbf675#ybToBzZ/WAoRjjugeH6N2YXZKEBlswaNI/J41GBmFYU= sudo btrfs dev scan Scanning for Btrfs filesystems sudo btrfs fi show warning, device 3 is missing checksum verify failed on 12678831570944 found 3DC57E3E wanted 771D2379 checksum verify failed on 12678831570944 found 3DC57E3E wanted 771D2379 bytenr mismatch, want=12678831570944, have=10160133442474442752 Couldn't read chunk tree Label: none uuid: 2dab74bb-fc73-4c47-a413-a55840f6f71e Total devices 3 FS bytes used 3.80TiB devid 1 size 3.64TiB used 1.92TiB path /dev/sdb devid 2 size 3.64TiB used 1.92TiB path /dev/sda *** Some devices missing sudo blkid /dev/sda: UUID="2dab74bb-fc73-4c47-a413-a55840f6f71e" UUID_SUB="7262d027-202a-4b29-aaf8-0bb8cf107d4d" TYPE="btrfs" /dev/sdb: UUID="2dab74bb-fc73-4c47-a413-a55840f6f71e" UUID_SUB="afa4cff8-d037-472e-9eb1-070d331b6a20" TYPE="btrfs" /dev/sdc1: UUID="6731963f-5bf9-458c-a44d-6f0bbea38357" TYPE="ext2" PARTUUID="ccb00f7e-01" /dev/sdc5: UUID="522XeT-jWNr-O0oG-HeHV-akQu-AR3P-fzeUAy" TYPE="LVM2_member" PARTUUID="ccb00f7e-05" /dev/sdd1: LABEL="Verbatim HDD" UUID="70947DE1947DAA6C" TYPE="ntfs" PARTUUID="58334162-01" /dev/mapper/uncik--srv--vg-root: UUID="15b50e38-d4cc-454c-ba0f-80adbb4cd4e1" TYPE="ext4" /dev/mapper/uncik--srv--vg-swap_1: UUID="c9db5981-acc3-43bb-a209-a213b80cc9cb" TYPE="swap" sudo btrfs check /dev/sda warning, device 3 is missing checksum verify failed on 12678831570944 found 3DC57E3E wanted 771D2379 checksum verify failed on 12678831570944 found 3DC57E3E wanted 771D2379 bytenr mismatch, want=12678831570944, have=10160133442474442752 Couldn't read chunk tree Couldn't open file system Thank you Tomas ------------------------------------------------------------------------ *From:* Chris Murphy *Sent:* Monday, July 04, 2016 9:01PM *To:* Tomáš Hrdina, Btrfs Btrfs *Subject:* Re: Unable to mount degraded RAID5 On Mon, Jul 4, 2016 at 12:54 PM, Tomáš Hrdina wrote: > Degraded gives same result: > > sudo mount -t btrfs -o ro,degraded /dev/sda /shares > mount: wrong fs type, bad option, bad superblock on /dev/sda, > missing codepage or helper program, or other error > > In some cases useful info is found in syslog - try > dmesg | tail or so. > That's bad. What are the kernel messages for the mount attempt? Do the following and report back all the results. # btrfs dev scan # btrfs fi show # blkid # btrfs check /dev/sda Also, make sure you reply to the btrfs list also and not just to me personally. And also don't top post or it'll annoy some people on the list. --- Tato zpráva byla zkontrolována na viry programem Avast Antivirus. https://www.avast.com/antivirus