But first I would recommend you to check what CEPH is, how it works, etc. I have the feeling, you not exactly know what CEPH is, what it does (or not) and how it works.
Yes, because CEPH doesn't care about your services. CEPH is a network storage, you only store your virtual disks on it. Really, you should check what CEPH is or not.
If you want to have HA you need a minimum of two nodes and three Monitors, otherwise it will not work. Normally you should start with an odd number of storages and monitors, at least a minimum of three of both.
