It was removed from documentation "Minimum of three nodes required.". We need from this information as proof to the customer Reported by: cschimid https://access.redhat.com/documentation/en-us/red_hat_ceph_storage/5/html/installation_guide/red-hat-ceph-storage-considerations-and-recommendations#annotations:e9effc22-e507-4cc6-915d-b0ea63571ea6