This is the point.. Linbit doesnt offer a Proxmox 4.4 compatible version yet.. why? because they are not expert in proxmox and dont want to spend so much time creating a compatible version... there is where you should be appearing to provide a fast update. You are interested we use proxmox and not OpenStack..I do not get your point. DRBD9 plugin if offered by linbit.com, why don´t you just use it?