Hey All. After a power failure, I encountered a checksum error on a backup disk, reported by btrfs scrub. I failed to identify any particular file affected by the reported "error at logical 250492215296".
How do I get rid of the corruption reported by btrfs scrub? Since this is a backup disk, deleting any affected file or snapshot would be fine. uname -a Linux dozer 4.15.0-43-generic #46-Ubuntu SMP Thu Dec 6 14:45:28 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux btrfs --version btrfs-progs v4.15.1 btrfs fi show Label: 'BtrfsBackups' uuid: bacbfa3e-b200-4ed4-888c-e2cdf5ca3ed8 Total devices 1 FS bytes used 2.23TiB devid 1 size 3.64TiB used 2.58TiB path /dev/mapper/d6 btrfs fi df /backup Data, single: total=2.54TiB, used=2.23TiB System, DUP: total=64.00MiB, used=368.00KiB Metadata, DUP: total=18.00GiB, used=5.49GiB GlobalReserve, single: total=512.00MiB, used=0.00B dmesg [278033.156632] BTRFS info (device dm-2): use zstd compression, level 0 [278033.156635] BTRFS info (device dm-2): enabling auto defrag [278033.156637] BTRFS info (device dm-2): disk space caching is enabled [278033.156638] BTRFS info (device dm-2): has skinny extents [278033.250808] BTRFS info (device dm-2): bdev /dev/mapper/d6 errs: wr 0, rd 0, flush 0, corrupt 4, gen 0 [296190.630316] BTRFS error (device dm-2): bdev /dev/mapper/d6 errs: wr 0, rd 0, flush 0, corrupt 5, gen 0 [296190.630326] BTRFS error (device dm-2): unable to fixup (regular) error at logical 250492215296 on dev /dev/mapper/d6 [300491.284115] perf: interrupt took too long (4959 > 4958), lowering kernel.perf_event_max_sample_rate to 40250 [321935.768710] BTRFS info (device dm-2): use zstd compression, level 0 [321935.768714] BTRFS info (device dm-2): enabling auto defrag [321935.768716] BTRFS info (device dm-2): disk space caching is enabled [321935.768717] BTRFS info (device dm-2): has skinny extents [321935.866552] BTRFS info (device dm-2): bdev /dev/mapper/d6 errs: wr 0, rd 0, flush 0, corrupt 5, gen 0 btrfs scrub status /backup/ scrub status for bacbfa3e-b200-4ed4-888c-e2cdf5ca3ed8 scrub started at Tue Jan 8 05:01:02 2019 and finished after 04:16:48 total bytes scrubbed: 2.24TiB with 1 errors error details: csum=1 corrected errors: 0, uncorrectable errors: 1, unverified errors: 0 btrfs inspect-internal logical-resolve 250492215296 /backup/ <NO-OUTPUT> -- Yours sincerely, Tim Janik https://testbit.eu/timj Free software author
