Migrating existing ceph rbd disks to ON


I would like to integrate existing disks on ceph into Open Nebula.
These VMs are already running under KVM (manual configuration).

These disks are persistent (Databases, Fileservers, etc.).

Other cloud solutions (Proxmox for example) were working fine, when I created the VM (same MAC, vlans, etc.) but with a 1G disk. I then deleted the image via rbd and renamed the production one. On next boot, the size was updated in the control panel and everything was fine.

What is the best way to accomplish this on ON?

Thank you very much.