I currently manage an oVirt installation and was surprised to see almost 20GB of memory allocated on the management node before I had a single VM spun up. It's

I currently manage an oVirt installation and was surprised to see almost 20GB of memory allocated on the management node before I had a single VM spun up. It's not light, but it is powerful. Makes resizing disks, setting up networks, connecting to storage domains (Fibre Channel, iSCSI, NFS, etc), migrating VMs, logging, and many other common tasks very easy to do. The latest release, 4.0 has a beautiful dashboard that gives you a quick overview of your pool of resources. Finally, every guest OS I've run has a build of an ovirt agent that reports back to the management node on its configuration (installed software, cpu/mem/io usage, ip addresses, hostname, etc).