Use bookmarks for intermediary and replication streams

[plagerweij]

System information

Type	Version/Name
Distribution	Ubuntu 20.04.2 LTS
Kernel Version	5.4.0-80-generic
Architecture	x86_64
OpenZFS Version	2.1.0-1

It is not possible to send intermediary snapshots using bookmarks. E.g.

zfs snap tank/src@1
zfs send tank/src@1 | zfs recv tank/dest
zfs bookmark tank/src@1 tank/src#1
zfs snap tank/src@2
zfs snap tank/src@3
zfs send -I "#1" tank/src@3 | zfs recv tank/dest

Error: multiple snapshots cannot be sent from a bookmark.
cannot receive: failed to read from stream

How is it that it gives this error? Since normal incremental replications (-i) do work with bookmarks.

I would like to use this in combination with the -R flag. Currently I'm trying to replicate my entire boot pool incrementally including newly created boot environments, whilst saving space using bookmarks. -R with -I can send new clones and any intermediary snapshots, but unfortunately not using bookmarks, or so it seems.

As a side note, the following gives the same error when just using -i:

zfs send -R -i "#1" tank/src@3 | zfs recv tank/dest