Responses inline

A gluster volume cannot span multiple clusters. If you want to create a separate cluster with the Broadwell nodes, then create a new gluster volume using the disks from these nodes - i.e do not expand the existing volume by adding bricks from the new servers.

 

2) I'm using a separate VLAN+domain name for gluster, and oVirt is proposing me to use the gluster (storage) domain names as the new hosts identifier.

You can add hosts using the Add new host flow - and provide the FQDN that you want as management interface, and later associate the gluster VLAN with a network that has "gluster" role.

Please keep in mind that you cannot add this to a new cluster in oVirt if you have already used bricks from these servers on existing volume in another cluster