I installed oVirt 4.0 master on top of oVirt Node Next Generation using oVirt Engine Appliance for Hosted Engine. I installed also RDO Mitaka all-in-one form CentOS Cloud SIG.
Then I installed ManageIQ nightly OVA and added oVirt as infrastructure provider and Mitaka as cloud provider. I have 2 nodes and 6 VMs in total (Hosted Engine, Mitaka, ManageIQ, CentOS 7 Atomic, Foreman and Katello on CentOS 7, CentOS 7 + Docker)
After 2 days uptime ManageIQ stopped to work with no space left on device.