I'm reading through all of the documentation at https://ovirt.org/documentation/, and am a bit overwhelmed with all of the different options for installing oVirt. 

My particular use case is that I'm looking for a way to manage VMs on multiple physical servers from 1 interface, and be able to deploy new VMs (or delete VMs) as necessary. Ideally, it would be great if I could move a VM from 1 host to a different host as well, particularly in the event that 1 host becomes degraded (bad HDD, bad processor, etc...)

I'm trying to figure out what the difference is between an oVirt Node and the oVirt Engine, and how the engine differs from the Manager.

I get the feeling that `Engine` = `Manager`. Same thing. I further think I understand the Engine to be essentially synonymous with a vCenter VM for ESXi hosts. Is this correct?

If so, then what's the difference between the `self-hosted` vs the `stand-alone` engines?

oVirt Engine requirements look to be a minimum of 4GB RAM and 2CPUs.

oVirt Nodes, on the other hand, require only 2GB RAM.

Is this a requirement just for the physical host, or is that how much RAM that each oVirt node process requires? In other words, if I have a physical host with 12GB of physical RAM, will I only be able to allocate 10GB of that to guest VMs? How much of that should I dedicated to the oVirt node processes?

Can you install the oVirt Engine as a VM onto an existing oVirt Node? And then connect that same node to the Engine, once the Engine is installed?

Reading through the documentation, it also sounds like oVirt Engine and oVirt Node require different versions of RHEL or CentOS.

I read that the Engine for oVirt 4.4.0 requires RHEL (or CentOS) 8.2, whereas each Node requires 7.x (although I'll plan to just use the oVirt Node ISO).

I'm also wondering about storage.

I don't really like the idea of using local storage, but a single NFS server would also be a single point of failure, and Gluster would be too expensive to deploy, so at this point, I'm leaning towards using local storage.

Any advice or clarity would be greatly appreciated.

Thanks,

David