And I might have misread where your problems actually are... Because oVirt was born on SAN but tries to be storage agnostic, it creates its own overlay abstraction, a block layer that is then managed within oVirt even when you use NFS or GlusterFS underneath. "The ISO domain" has actually been deprecated and ISO images can be put into any domain type (e.g. also data). But they still have to be uploaded to that domain via the management engine GUI, you can't just copy the ISO images somewhere within the files and directories oVirt might create and expect them to be visible to the GUI or the VMs.