Move Ceph-Cluster to another Datacenter

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Hey Ceph people,

need advise on how to move a ceph-cluster from one datacenter to another without any downtime :)

DC 1:
3 dedicated MON-Server (also MGR on this Servers)
4 dedicated OSD-Server (3x12 OSD, 1x 23 OSDs)

3 Proxmox Nodes with connection to our Ceph-Storage (not managed from proxmox! Ceph is a standalone installation)

DC 2:
No Ceph-related Server actualy

Luminous (12.2.4)
Only one Pool:
    NAME        ID     USED       %USED     MAX AVAIL     OBJECTS
    rbd         0      30638G     63.89        17318G     16778324

I need to move my Ceph instalation from DC1 to DC2 and would realy be happy if you could give me some advise on how to do this without any downtime and in a still performant manner.

The latency from DC1 to DC2 is ~1,5ms - could perhaps bring up a 10GB fiber connection between DC1 and DC2..

A second Ceph-Cluster on DC2 is for cost reasons not possible but i could bring a 5th OSD Server Online there. So "RBD-Mirror" isn't actualy passable way - but i will try to make this possible ^^ ...
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