You can see it as Debian, with a web gui for managing virtualized resources. Ceph is not required, but it is something nice to have if you have many hypervisors

You can see it as Debian, with a web gui for managing virtualized resources. Ceph is not required, but it is something nice to have if you have many hypervisors and no central storage. But it is meant for using the machine mainly as an hypervisor, not as a desktop with the ability to ocasionally run a few virtual machines (in that case kvm+virt_manager or virtualbox are more desktop friendly).