From: Felix Koop <fdp@fkoop.de>
To: linux-btrfs <linux-btrfs@vger.kernel.org>
Subject: Help needed to recover a RAID5 btrfs
Date: Mon, 25 May 2015 18:06:20 +0200 (CEST) [thread overview]
Message-ID: <508094243.133459.1432569980190.JavaMail.open-xchange@oxbsltgw09.schlund.de> (raw)
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
next reply other threads:[~2015-05-25 16:06 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-05-25 16:06 Felix Koop [this message]
2015-05-26 5:38 ` Help needed to recover a RAID5 btrfs Duncan
2015-05-26 5:56 ` Qu Wenruo
2015-05-26 20:15 ` Felix Koop
2015-05-30 12:03 ` Felix Koop
2015-05-26 22:44 ` Omar Sandoval
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