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 -- Bernd Lentes Systemadministration institute of developmental genetics Gebäude 35.34 - Raum 208 HelmholtzZentrum München bernd.len...@helmholtz-muenchen.de phone: +49 (0)89 3187 1241 fax: +49 (0)89 3187 2294 no backup - no mercy Helmholtz Zentrum Muenchen Deutsches Forschungszentrum fuer Gesundheit und Umwelt (GmbH) Ingolstaedter Landstr. 1 85764 Neuherberg www.helmholtz-muenchen.de Aufsichtsratsvorsitzende: MinDir'in Baerbel Brumme-Bothe Geschaeftsfuehrer: Prof. Dr. Guenther Wess, Heinrich Bassler, Dr. Alfons Enhsen Registergericht: Amtsgericht Muenchen HRB 6466 USt-IdNr: DE 129521671 -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
