[ovirt-users] oVirt 4.2 how to upgrade

I have a 3 node oVirt 4.2.1 cluster, i'm using a self-hosted engine architecture and storage-engine is on a glusterfs replica 3 of the cluster. The oldest CPU is SandyBridge family (E5-2609) and incidentally it has connectivity problems with IPMI NIC, but Hosted Engine HA is enabled and working. May I reduce the glusterfs replica to 2 and use one of the 3 nodes to begin the installation of ovirt 4.4 on that node? Fedele