From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mout.kundenserver.de ([212.227.17.10]:61508 "EHLO mout.kundenserver.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750771AbbEYQGX convert rfc822-to-8bit (ORCPT ); Mon, 25 May 2015 12:06:23 -0400 Received: from oxbsltgw09.schlund.de ([172.19.249.26]) by mrelayeu.kundenserver.de (mreue102) with ESMTPSA (Nemesis) id 0M7sZ6-1ZJ09629Ro-00vKvF for ; Mon, 25 May 2015 18:06:20 +0200 Date: Mon, 25 May 2015 18:06:20 +0200 (CEST) From: Felix Koop Reply-To: Felix Koop To: linux-btrfs Message-ID: <508094243.133459.1432569980190.JavaMail.open-xchange@oxbsltgw09.schlund.de> Subject: Help needed to recover a RAID5 btrfs MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Sender: linux-btrfs-owner@vger.kernel.org List-ID: Hello, I have a RAID5 filesystem where one disk has crashed. Now the filesystem is not recognized any more. Any help available? Here is some info: root@server:~# uname -a Linux server 4.0.0-1-amd64 #1 SMP Debian 4.0.2-1 (2015-05-11) x86_64 GNU/Linux root@server:~# btrfs --version btrfs-progs v4.0 root@server:~# btrfs f sh /dev/Data1vg/afs0 warning, device 3 is missing warning devid 3 not found already checksum verify failed on 1111813750784 found 18019A1D wanted FCE227AB checksum verify failed on 1111813750784 found 18019A1D wanted FCE227AB bytenr mismatch, want=1111813750784, have=65536 Couldn't read tree root Label: none uuid: 7d4b023a-a1ef-4991-b01d-31e7c4fdfbcf Total devices 3 FS bytes used 213.96GiB devid 2 size 150.00GiB used 108.53GiB path /dev/mapper/Data1vg-afs0 devid 4 size 150.00GiB used 108.53GiB path /dev/mapper/Data3vg-afs0 *** Some devices missing btrfs-progs v4.0 root@server:~# mount -o degraded -r /dev/Data1vg/afs0 /mnt mount: wrong fs type, bad option, bad superblock on /dev/mapper/Data1vg-afs0, missing codepage or helper program, or other error In some cases useful info is found in syslog – try dmesg | tail or so. root@server:~# dmesg | tail [104991.996065] BTRFS: open_ctree failed [105527.836798] blk_update_request: I/O error, dev fd0, sector 0 [105527.839477] floppy: error -5 while reading block 0 [105555.615991] BTRFS info (device dm-52): allowing degraded mounts [105555.616000] BTRFS info (device dm-52): disk space caching is enabled [105555.665644] BTRFS: bdev (null) errs: wr 38, rd 0, flush 0, corrupt 0, gen 0 [105556.213570] BTRFS (device dm-52): bad tree block start 14290338419558610620 1111828267008 [105556.216649] BTRFS (device dm-52): bad tree block start 14290338419558610620 1111828267008 [105556.219364] BTRFS: Failed to read block groups: -5 [105556.236056] BTRFS: open_ctree failed If more info is needed, just tell me what I should do. Thanks. --- Kind greetings Felix Koop