Hey Angelo,

what you're asking for is "Live Migration".
https://docs.ceph.com/en/latest/rbd/rbd-live-migration/ says:
The live-migration copy process can safely run in the background while the new 
target image is in use. There is currently a requirement to temporarily stop 
using the source image before preparing a migration when not using the 
import-only mode of operation. This helps to ensure that the client using the 
image is updated to point to the new target image.
Best regards,
Jan-Philipp
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