I had this issue this week as well.

When asked about the glusterfs that you self provisioned you stated "ovirt1.localdomain:/gluster_bricks/engine”

So I am new to gluster but as a client of gluster you can only refer to it via volume name.

host:/<volume name>

Hence maybe try ovirt1.localdomain:/engine.

That did the trick for me. Hope this helps. Cost me a week.

Jurie