Is it possible to join an external Ceph Hammer with pve 6


Nov 28, 2019
We have an old PVE-Cluster 4.4 with an external Ceph Hammer. I want join the old Ceph cluster from the new PVE 6.1 with internal Ceph for to copy the VM's from old to new.
Joining the Ceph Hammer everything looks fine, until I want to see the content. Trying to do this I get the message "rbd error: rbd: listing images failed: (95) Operation not supported (500) ".
I wonder if the combination is supported at all.


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