OK. The problem was that the original subvolume had a "Received UUID".
This caused all subsequent snapshots to have the same Received UUID
which messes up Btrfs send | receive. Of course this means I must have
used btrfs send | receive to create that subvolume and then turned it
r/w at some point, though I cannot remember ever doing this.
Perhaps a clear notice "WARNING: make sure that the source subvolume
does not have a Received UUID" on the Wiki would be helpful? Both on
https://btrfs.wiki.kernel.org/index.php/Incremental_Backup and on
https://btrfs.wiki.kernel.org/index.php/Manpage/btrfs-property
Regards,
A
On 7/28/2017 9:32 PM, Hermann Schwärzler wrote:
Hi
for me it looks like those snapshots are not read-only. But as far as
I know for using send they have to be.
At least
https://btrfs.wiki.kernel.org/index.php/Incremental_Backup#Initial_Bootstrapping
states "We will need to create a read-only snapshot ,,,"
I am using send/receive (with read-only snapshots) on a regular basis
and never had a problem like yours.
What are the commands you use to create your snapshots?
Greetings
Hermann
On 07/28/2017 07:26 PM, A L wrote:
I often hit the following error when doing incremental btrfs
send-receive:
Btrfs incremental send | receive fails with Error: File not found
Sometimes I can do two-three incremental snapshots, but then the same
error (different file) happens again. It seems that the files were
changed or replaced between snapshots, which is causing the problems for
send-receive. I have tried to delete all snapshots and started over but
the problem comes back, so I think it must be a bug.
The source volume is: /mnt/storagePool (with RAID1 profile)
with subvolume: volume/userData
Backup disk is: /media/usb-backup (external USB disk)
[...]
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