Hi, for those who missed it, a guide has been created to help migrating from 3.6 running on EL6 to 4.0 running on EL7 which also applies to 3.6 on FC22 to 4.0 on FC23. You can find the guide here: http://www.ovirt.org/documentation/migration-engine-3.6-to-4.0/ For hosted engine a guide is under review on GitHub here: https://github.com/oVirt/ovirt-site/pull/296 pending to fix some issue with travis build. If you're doing an upgrade with OS migration, feedback, suggestions and improvements are welcome. Thanks, -- Sandro Bonazzola Better technology. Faster innovation. Powered by community collaboration. See how it works at redhat.com