Hi, I suggest you check on #btrfs on freenode irc. They are very helpful there. Don't try to recover more before you get advice. Good luck! ---- From: Panicx <panicx@xxxxxxxxx> -- Sent: 2020-05-20 - 16:46 ---- > Hello all, > > I had a recovery event a few days ago that completed, and as far as I > can tell, the array is clean. > root@xubuntu:/mnt/md0# mdadm -D /dev/mapper/vg0-lv0 > /dev/mapper/vg0-lv0: > Version : 1.2 > Creation Time : Mon Mar 30 19:44:30 2020 > Raid Level : raid5 > Array Size : 17571291136 (16757.29 GiB 17993.00 GB) > Used Dev Size : unknown > Raid Devices : 4 > Total Devices : 4 > Persistence : Superblock is persistent > > Intent Bitmap : Internal > > Update Time : Tue May 19 19:04:43 2020 > State : clean > Active Devices : 4 > Working Devices : 4 > Failed Devices : 0 > Spare Devices : 0 > > Layout : left-symmetric > Chunk Size : 128K > > Name : TNAS-2CC8E6:UTOSUSER-X86-S64 > UUID : cc80e7cd:c6b902c4:ef36b897:409e8f96 > Events : 18518 > > Number Major Minor RaidDevice State > 0 8 20 0 active sync /dev/sdb4 > 1 8 36 1 active sync /dev/sdc4 > 2 8 52 2 active sync /dev/sdd4 > 4 8 4 3 active sync /dev/sda4 > > I cannot mount it: > root@xubuntu:/mnt/md0# mount -t btrfs /dev/mapper/vg0-lv0 /mnt/md0/ > mount: /mnt/md0: wrong fs type, bad option, bad superblock on > /dev/mapper/vg0-lv0, missing codepage or helper program, or other > error. > > I cannot check it: > root@xubuntu:/mnt/md0# btrfsck /dev/mapper/vg0-lv0 > bytenr mismatch, want=441707118592, have=0 > Couldn't read tree root > ERROR: cannot open file system > > I cannot mount it readonly with the backuproot option, either: > root@xubuntu:/mnt/md0# mount -t btrfs -o ro,usebackuproot > /dev/mapper/vg0-lv0 /mnt/md0/ > mount: /mnt/md0: wrong fs type, bad option, bad superblock on > /dev/mapper/vg0-lv0, missing codepage or helper program, or other > error. > > Please help :) I'd like to get some baby photos/vids out of that > array before I call it a lost cause. Some of the photos are for > babies that aren't here anymore, and they are all I have. > > root@xubuntu:/mnt/md0# uname -a > Linux xubuntu 4.15.0-20-generic #21-Ubuntu SMP Tue Apr 24 06:15:38 UTC > 2018 i686 i686 i686 GNU/Linux > root@xubuntu:/mnt/md0# btrfs --version > btrfs-progs v4.15.1 > root@xubuntu:/mnt/md0# btrfs fi show > Label: none uuid: 9ef00e00-ea8a-4b29-b8b1-4ce6e85a7e7f > Total devices 1 FS bytes used 5.59TiB > devid 1 size 16.36TiB used 5.64TiB path /dev/mapper/vg0-lv0 > ## Note: I cannot mount the filesystem: > root@xubuntu:/mnt/md0# btrfs fi df /mnt/md0 > ERROR: not a btrfs filesystem: /mnt/md0
