I'm attempting to perform a backup to an external hard drive. Both the
native drive and external drive use a BTRFS filesystem. I do this by
first creating a read-only snapshot of my home directory:
# btrfs subvolume snapshot -r /home /.snapshots/home/BACKUP
Followed by a send/receive to the backup drive:
# btrfs send /.snapshots/home/BACKUP | btrfs receive /.backup/home
I get this output:
At subvol /.snapshots/home/BACKUP
At subvol BACKUP
ERROR: failed to clone extents to matt/.local/share/Anki2/Matt/collection.anki2: Invalid argument
There several files that trigger this error (most of them .sqlite
files). I can delete the offending files, which causes the backup to
work. However, new offending files are created that recreate the error
(e.g. Firefox generates lots of offending .sqlite files).
I performed
# btrfs scrub start -B /
which exited without errors and failed to resolve the issue and I even
ran check --repair on my filesystem unmounted:
# btrfs check --repair /dev/mapper/...
which didn't make a difference.
uname -a:
Linux ryzen3950 5.5.0 #1-NixOS SMP Mon Jan 27 00:23:03 UTC 2020 x86_64 GNU/Linux
btrfs --version
btrfs-progs v5.4.1
btrfs fi show
Label: 'btrfs' uuid: d31878d6-3a77-4f0f-9fdd-bb9a2c4e578b
Total devices 2 FS bytes used 737.53GiB
devid 1 size 931.01GiB used 853.03GiB path /dev/mapper/cryptnvme
devid 2 size 931.50GiB used 853.03GiB path /dev/mapper/cryptnvme1
Label: 'backup' uuid: 0bd10808-0330-4736-9425-059d4a0a300e
Total devices 2 FS bytes used 473.34GiB
devid 1 size 1.82TiB used 475.01GiB path /dev/mapper/cryptsda1
devid 2 size 1.82TiB used 475.01GiB path /dev/mapper/cryptsdb1
btrfs fi df /
Data, RAID0: total=1.44TiB, used=730.13GiB
System, RAID1: total=32.00MiB, used=144.00KiB
Metadata, RAID1: total=20.00GiB, used=7.40GiB
GlobalReserve, single: total=512.00MiB, used=0.00B
Here's the output of dmesg. I've only taken the lines containing
dmesg. Please let me know if this is insufficient and I'll provide the
full log.
[ 1.168132] stage-1-init: loading module btrfs...
[ 1.442869] Btrfs loaded, crc32c=crc32c-intel
[ 14.552850] BTRFS: device label backup devid 2 transid 303 /dev/mapper/cryptsdb1 scanned by btrfs (857)
[ 14.553396] BTRFS: device label backup devid 1 transid 303 /dev/mapper/cryptsda1 scanned by btrfs (857)
[ 14.553487] BTRFS: device label btrfs devid 2 transid 409463 /dev/mapper/cryptnvme1 scanned by btrfs (857)
[ 14.553573] BTRFS: device label btrfs devid 1 transid 409463 /dev/mapper/cryptnvme scanned by btrfs (857)
[ 14.553634] stage-1-init: Scanning for Btrfs filesystems
[ 14.561445] BTRFS info (device dm-0): use lzo compression, level 0
[ 14.561447] BTRFS info (device dm-0): enabling ssd optimizations
[ 14.561447] BTRFS info (device dm-0): disk space caching is enabled
[ 14.561448] BTRFS info (device dm-0): has skinny extents
[ 14.637769] BTRFS info (device dm-0): checking UUID tree
[ 14.786327] BTRFS info (device dm-0): disk space caching is enabled
[ 15.926714] BTRFS info (device dm-0): device fsid d31878d6-3a77-4f0f-9fdd-bb9a2c4e578b devid 1 moved old:/dev/mapper/cryptnvme new:/dev/dm-0
[ 15.926763] BTRFS info (device dm-0): device fsid d31878d6-3a77-4f0f-9fdd-bb9a2c4e578b devid 2 moved old:/dev/disk/by-uuid/d31878d6-3a77-4f0f-9fdd-bb9a2c4e578b new:/dev/dm-1
[ 16.043567] BTRFS info (device dm-0): disk space caching is enabled
[ 16.074722] BTRFS info (device dm-2): use lzo compression, level 0
[ 16.074723] BTRFS info (device dm-2): disk space caching is enabled
[ 16.074724] BTRFS info (device dm-2): has skinny extents
[27057.785935] BTRFS info (device dm-0): scrub: started on devid 1
[27057.800078] BTRFS info (device dm-0): scrub: started on devid 2
[27107.287558] BTRFS info (device dm-0): scrub: not finished on devid 1 with status: -125
[27107.316437] BTRFS info (device dm-0): scrub: not finished on devid 2 with status: -125
[27109.542589] BTRFS info (device dm-0): scrub: started on devid 1
[27109.556751] BTRFS info (device dm-0): scrub: started on devid 2
[27243.975463] BTRFS info (device dm-0): scrub: finished on devid 1 with status: 0
[27247.857511] BTRFS info (device dm-0): scrub: finished on devid 2 with status: 0
[250470.993201] [ 23284] 0 23284 3204 25 45056 0 0 btrfs
[250470.993203] [ 23286] 0 23286 1155 53 40960 0 0 btrfs
Thanks!
Matt
