Thank you, Jason. As usual you're very helpful. :-)



Zitat von Jason Dillaman <jdillama@redhat.com>:

> On Tue, Sep 22, 2020 at 7:23 AM Eugen Block <eblock@nde.ag> wrote:
>>
>> It just hit me when I pushed the "send" button: the (automatically
>> created) first snapshot initiates the first full sync to catch up on
>> the remote site, but from then it's either a manual process or the
>> snapshot schedule. Is that it?
>
> Indeed. You will get implicit mirroring snapshots created whenever you
> enable/promote/demote. You can see the snapshots by using "rbd snap ls
> --all <image-spec>" (since normally only user-created snapshots are
> shown).
>
> Besides the implicit mirror snapshot actions above, you will now need
> to explicitly create a mirror snapshot via "rbd mirror image snapshot"
> or via the mirror snapshot schedule in order to transfer any image
> deltas.
>
>> Zitat von Eugen Block <eblock@nde.ag>:
>>
>> > Hi *,
>> >
>> > I encountered a rather strange (or at least unexpected) behaviour of
>> > the rbd-mirror. Maybe I don't fully understand the feature so please
>> > correct me if my assumptions are wrong.
>> >
>> > My two (virtual one-node) clusters are still on ceph version
>> > 15.2.4-864-g0f510cb110 and the following happens if I'm trying to
>> > configure snapshot-based rbd-mirroring:
>> >
>> > - I create a one-way replication from site A to site B
>> > - Mirror mode is image (for snapshot-based mirroring)
>> > - Import image on site A (no journal-feature enabled to make sure)
>> > - Image is replicated as soon as I enable the mirror mode on that  
>> image with:
>> >> rbd mirror image enable pool/image3 snapshot
>> > - rbd info shows "snapshot_count: 1" although I haven't created a
>> > snapshot of this image yet, and there's also no schedule:
>> >
>> >> siteA:~ # rbd mirror snapshot schedule ls
>> >> siteA:~ #
>> >
>> > This is the third image in this test, I only created one snapshot
>> > for image1, not for the other images. Is this expected? From the
>> > docs I assumed I have to either create snapshots manually or
>> > configure the rbd mirror snapshot schedule. Could anyone please
>> > clarify?
>> >
>> > Thank you!
>> > Eugen
>>
>>
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>
>
> --
> Jason