Hello,
I try to backup my laptop over an unreliable slow internet connection to
a even slower Raspberry Pi.
To bootstrap the backup I used the following:
# local
btrfs send root.send.ro | pigz | split --verbose -d -b 1G
rsync -aHAXxv --numeric-ids --partial --progress -e "ssh -T -o
Compression=no -x" x* remote-host:/mnt/backup/btrfs-backup/
# remote
cat x* > split.gz
pigz -d split.gz
btrfs receive -f split
worked nicely. But I don't understand why the "received uuid" on the
remote site in blank.
I tried it locally with smaller volumes and it worked.
The 'split' file contains the correct uuid, but it is not set (remote).
remote$ btrfs receive --dump -f split | head
subvol ./root.send.ro uuid=99a34963-3506-7e4c-a82d-93e337191684
transid=1232187
local$ sudo btrfs sub show root.send.ro| grep -i uuid:
UUID: 99a34963-3506-7e4c-a82d-93e337191684
Questions:
- Is there a way to set the "received uuid"?
- Is it a matter of btrfs-progs version difference?
- What whould be a better approach?
Thank you
----
# local
root@fos ~$ uname -a
Linux fos 5.9.16-200.fc33.x86_64 #1 SMP Mon Dec 21 14:08:22 UTC 2020
x86_64 x86_64 x86_64 GNU/Linux
root@fos ~$ btrfs --version
btrfs-progs v5.9
root@fos ~$ btrfs fi show
Label: 'DATA' uuid: b6e675b3-84e3-4869-b858-218c5f0ac5ad
Total devices 1 FS bytes used 402.17GiB
devid 1 size 464.27GiB used 414.06GiB path
/dev/mapper/luks-e4e69cfa-faae-4af8-93f5-7b21b25ab4e6
root@fos ~$ btrfs fi df /btrfs-root/
Data, single: total=404.00GiB, used=397.80GiB
System, DUP: total=32.00MiB, used=64.00KiB
Metadata, DUP: total=5.00GiB, used=4.38GiB
GlobalReserve, single: total=512.00MiB, used=0.00B
# remote
root@pih:~# uname -a
Linux pih 5.4.72+ #1356 Thu Oct 22 13:56:00 BST 2020 armv6l GNU/Linux
root@pih:~# btrfs --version
btrfs-progs v4.20.1
root@pih:~# btrfs fi show
Label: 'DATA' uuid: 6be1e09c-d1a5-469d-932b-a8d1c339afae
Total devices 1 FS bytes used 377.57GiB
devid 2 size 931.51GiB used 383.06GiB path
/dev/mapper/luks_open_backup0
root@pih:~# btrfs fi df /mnt/backup
Data, single: total=375.00GiB, used=374.25GiB
System, DUP: total=32.00MiB, used=64.00KiB
Metadata, DUP: total=4.00GiB, used=3.32GiB
GlobalReserve, single: total=512.00MiB, used=0.00B
dmesg is empty for the time of import/btrfs receive.
