Firewall rules passed to oivrt-host-deploy must open the ports for brick usage starting at base-port 49217 for avoiding to interfere with libvirt migration.
Hi Sandro, Please provide full description of a problem with reproduction steps for it, so I could stick to them in order to verify this bug.
oVirt 3.6.0 has been released on November 4th, 2015 and should fix this issue. If problems still persist, please open a new BZ and reference this one.