Re: Problem ZFS send / receive 13.1-RELEASE

It's not a bug. The problem is that you can't combine zfs send -R and also
zfs recv -s .  The former creates several independent send streams.  But
the latter generates a token that will only resume a single stream. And
there's no way to fix the problem given ZFS's design. If the send gets
interrupted,  you need to go check on the destination side to see which
file datasets are incomplete and resume all of them.

On Mon, Jul 4, 2022, 5:53 AM thilo jeremias <thilo@nispuk.com> wrote:

> Hello everyone,
>
> I posted a question on (
> https://forums.freebsd.org/threads/zfs-replication-interrupted-and-resumed-missing-snapshots.85666/
> )
> Which I now think is a bug in zfs send/receive for 13.1-RELEASE
>
>
> Essentially, an interrupted & restarted receive does not create all
> snapshots from the stream.
>
> The following:
>
> #Interrupted transfer
> zfs send -R "$D@final" | dd bs=10m count=200 | zfs recv -s "$D"_bad
>
> #Resume transfer
> TOKEN="$(zfs get -H receive_resume_token   "$D"_bad  | cut -f 3)"
> zfs send -t "$TOKEN" | zfs recv -s "$D"_bad
>
>
> #Good transfer
> zfs send -R "$D@final" | zfs recv -s "$D"_good
>
>
>
> Produces:
>
> NAME                          USED  AVAIL     REFER  MOUNTPOINT
> Backup/testset_good@initial  85.2K      -      128K  -
> Backup/testset_good@add100m  85.2K      -      100M  -
> Backup/testset_good@add300m  85.2K      -      400M  -
> Backup/testset_good@del100m  85.2K      -      300M  -
> Backup/testset_good@del300m     0B      -      128K  -
> Backup/testset_good@final       0B      -      128K  -
> NAME                         USED  AVAIL     REFER  MOUNTPOINT
> Backup/testset_bad@initial  85.2K      -      128K  -
> Backup/testset_bad@add100m     0B      -      100M  -
>
>
> Which is not correct since it misses the snapshots from the original
> stream (“good”)
>
> Can this be reproduced by anyone else?
>
>
> Thilo
>
>
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>
>