pve4 drbd8 ha

Hello, i Actually, i use drbd 8.4.3 on proxmox 3.4. Two nodes with drbd and a 3rd for HA. I would like to upgrade to pve 4. I searched the forum but I have not found an answer. Is it possible to have two node with storage and a 3rd for HA ? drbd9 isn't stable and ceph is less efficient in what...