RE: SLES 11 SP4: can't mount btrfs

["Lentes, Bernd" <bernd.lentes@helmholtz-muenchen.de>]

> -----Original Message-----
> From: linux-btrfs-owner@vger.kernel.org [mailto:linux-btrfs-
> owner@vger.kernel.org] On Behalf Of Lentes, Bernd
> Sent: Thursday, October 19, 2017 7:44 PM
> To: Btrfs ML <linux-btrfs@vger.kernel.org>
> Subject: SLES 11 SP4: can't mount btrfs
>
> Hi,
>
> this is the continuation of a thread i started on a SLES forum
> (https://forums.suse.com/showthread.php?10109-lv-with-btrfs-corrupt-
> some-tips-please), but i think this is the more appropriate place.
> I have a SLES 11 SP4 with a btrfs on top of a logical volume i can't mount
> anymore. The host was fenced in a two-node cluster, and the boot
> procedure can't mount the lv, and i reside in simple shell (i assume the
> one from initrd).
>
> I have a second nearly identical node, so i can give you some information:
>
> ha-idg-2:/etc/corosync # uname -a
> Linux ha-idg-2 3.0.101-84-default #1 SMP Tue Oct 18 10:32:51 UTC 2016
> (15251d6) x86_64 x86_64 x86_64 GNU/Linux
>
> ha-idg-2:/etc/corosync # rpm -qa|grep -i btrfs
> libbtrfs0-3.18.2-0.40.48
> btrfsmaintenance-0.1-3.1
> btrfsprogs-3.18.2-0.40.48
>
> I try to follow the recommendations on
> https://btrfs.wiki.kernel.org/index.php/Problem_FAQ.
>
> I booted the system now with knoppix 8.1, which has kernel 4.12.7 and
> btrfs-progs 4.7.3-1. Is that ok ?
> I tried:
>
> mount /dev/vg1/lv_root /lv_root -o recovery,ro and got:
> mount: wrong fs type, bad option, bad superblock on /dev/mapper/vg1-
> lv_root,
>        missing codepage or helper program, or other error
>
>        In some cases useful info is found in syslog - try
>        dmesg | tail or so.
>
>
> and got via dmesg:
> [92518.955408] BTRFS info (device dm-0): disk space caching is enabled
> [92518.990561] BTRFS error (device dm-0): parent transid verify failed on
> 196314759168 wanted 793932 found 793496 [92518.990911] BTRFS error
> (device dm-0): parent transid verify failed on 196314759168 wanted
> 793932 found 793496 [92518.990919] BTRFS error (device dm-0): failed to
> read block groups: -5 [92519.070084] BTRFS error (device dm-0):
> open_ctree failed
>
> next step:
>
> root@Microknoppix:~# btrfs device scan
> Scanning for Btrfs filesystems
> root@Microknoppix:~#
>
> no result !?!
>
> Now i changed to https://btrfs.wiki.kernel.org/index.php/Restore:
>
> btrfs restore -smSvi /dev/vg1/lv_root /mnt/idg-
> 2/SysAdmin_AG_Wurst/recover/ha-idg-1/ |tee /mnt/idg-
> 2/SysAdmin_AG_Wurst/recover/ha-idg-1/recover.log
>
> I just started it. I get lines like:
> offset is 61440
> offset is 98304
> offset is 4096
> offset is 143360
> offset is 8192
> offset is 184320
>
> or
>
> Error searching /mnt/idg-2/SysAdmin_AG_Wurst/recover/ha-idg-
> 1/@/tmp/localhpsum/assets/doc/help/en
> Error searching /mnt/idg-2/SysAdmin_AG_Wurst/recover/ha-idg-
> 1/@/tmp/localhpsum/assets/doc/help/ja/images/callouts
>
> What does that mean ?
>
>
> Bernd
>

The process does not continue, but it's still visible with ps. Also top does 
not show that this process is consuming resources. iotop does not show any 
activity on my lv.
My logfile is unchanged for two hours. Does that mean that btrfs gave up or 
is it still struggling ?

Bernd
 

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