The engine-setup script should prompt the user to choose an application mode - virt [Manage virtualization only] - gluster [Manage gluster storage only] - both [Manage virtualization and gluster storage] Based on user's selection, following should happen: - Set the vdc option ApplicationMode appropriately - In case of gluster-only mode, do not prompt the user for DC storage type, and ISO path, as these are not relevant for gluster.