[ceph-users] Version compatibility with QEMU/KVM

Hi list, We've got some QEMU/KVM work load linked to librbd 14.2.21 (with backported patches), being complicated to "just upgrade" for the time being. With regard to compatibility, I'm curious about cluster versions. Are there specific features or other caveats to look out for when connecting such work load to an Octopus, a Pacific, a Quincy or even a Reef cluster? Sharing real world experience would be really, really appreciated. Cheers, Kees