rbd-mirror with snapshot, not doing any actaul data sync

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Hi list,

I've awaited octopus for a along time to be able to use mirror with
snapshotting, since my setup does not allow for journal based
mirroring. (K8s/Rook 1.3.x with ceph 15.2.2)

However, I seem to be stuck, i've come to the point where on the
cluster on which the (non-active) replicas should reside I get this:

```
rbd mirror pool status -p replicapool --verbose

...
pvc-f7ca0b55-ed38-4d9f-b306-7db6a0157e2e:
  global_id:   d3a301f2-4f54-4e9e-b251-c55ddbb67dc6
  state:       up+starting_replay
  description: starting replay
  service:     a on nldw1-6-26-1
  last_update: 2020-06-07 11:54:54
...
```

That seems good, right? But I don't see any actual data being copied
into the failover cluster.

Anybody any ideas what to check?

Also, is it correct, you won't see mirror snapshots with the 'normal'
`rbd snap` commands?

Thanks in advance,

Hans
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