You can take a look at the RHEV 4.3 documentation. https://access.redhat.com/documentation/en-us/red_hat_virtualization/4.3/htm... There is another good read at: https://access.redhat.com/documentation/en-us/red_hat_virtualization/4.3/htm... You should probably wait for 4.3.4 to arrive, since 4.3.3 is still a little bit rough on the edges. I can currently only create a new VM via the templates, because the normal creation dialog errors, when I change the datacenter. Otherwise the upgrade went very well. If you are running off of oVirt Node NG it is very straightforward. I did: 1. Check of all nodes are using firewalld. You have to switch all nodes to use firewalld, because Iptables is deprecated and removed in 4.3 as it was said in documentation. You have to re-install every node for that. So every node has to go through maintenance. 2. Upgrade the engine. First to the 4.2.8 then to 4.3.x My upgrade flow for this is: Engine Update START Minor Upgrades first enable global maintenance mode login to engine engine-upgrade-check yum update "ovirt-*-setup*" engine-setup yum update when success: disable global maintenance mode Major Upgrade enable global maintenance mode login to engine yum install http://resources.ovirt.org/pub/yum-repo/ovirt-release[releasenumber].rpm engine-upgrade-check yum update "ovirt-*-setup*" engine-setup remove the old ovirt release from /etc/yum.repos.d yum update when success: disable global maintenance mode Engine Upgrade END 3. Upgrade the nodes. First to 4.2.8 then as specified in ovirt release info: yum install https://resources.ovirt.org/pub/ovirt-4.3/rpm/el7/noarch/ovirt-node-ng-image... 4. Upgrade the Datacenter Compatibility to 4.3 This includes rebooting all VMs at one point. You can read about it in the documentation. Then you're done.