Hello, please help. I have a btrfs filesystem that does not mount any more. This is the error I get: root@tuxedo:~# mount -t btrfs /dev/md/8 /archive/ mount: /archive: wrong fs type, bad option, bad superblock on /dev/md8, missing codepage or helper program, or other error. root@tuxedo:~# btrfs check --readonly /dev/md/8 Opening filesystem to check... checksum verify failed on 525573472256 found 34F97C00 wanted 15AEE1E6 checksum verify failed on 525573472256 found 34F97C00 wanted 15AEE1E6 checksum verify failed on 525573472256 found 72A4DA2D wanted 5756BAAD checksum verify failed on 525573472256 found 34F97C00 wanted 15AEE1E6 bad tree block 525573472256, bytenr mismatch, want=525573472256, have=6438209987097185951 ERROR: cannot open file system relevant dmesg: [ 288.589999] BTRFS info (device md8): disk space caching is enabled [ 288.590004] BTRFS info (device md8): has skinny extents [ 291.596699] BTRFS error (device md8): bad tree block start 6438209987097185951 525573472256 [ 291.608786] BTRFS error (device md8): bad tree block start 2211084770032297782 525573472256 [ 291.608844] BTRFS error (device md8): failed to read block groups: -5 [ 291.660214] BTRFS error (device md8): open_ctree failed I am currently running kernel 4.15, but I tried also a 5.0 kernel and could not mount the data either. btrfs is version 4.20.2 on ubuntu disco. -- Mit freundlichen Grüßen Felix Koop fkoop@xxxxxxxx
