Hi there, We're looking to upgrade our hosted engine setup from 3.6 to 4.0 (or 4.1)... We built the 3.6 setup a couple of years ago with Fedora 22 (we wanted the newer-at-the-time kernel 4.4) on the hosts and engine, but when we move to 4.X we'd like to move to EL7 on the engine (as that seems to be the supported version) and to the oVirt Node ISO installer on the hypervisors. We've got only four hosts in our oVirt datacentre, configured in two clusters. Our current idea is to take a backup of the oVirt database using the backup-restore tool, and to take a 'dd' of the virtual disk too, for good measure. Then upgrade the engine to 4.X and confirm that the 3.6 hosts will run, and then finally piecemeal upgrade the hosts to 4.X using the oVirt Node ISO installer. Looking at this page - https://www.ovirt.org/documentation/self-hosted/chap-Maintenance_and_Upgradi... - it seems the 'hosted-engine --upgrade-appliance' path is the best way to do this... but because our hosts are running Fedora instead of EL, I think that makes this option moot to us. Is what I've suggested a valid upgrade path, or is there a more sane way of going about this? -C Cam Wright - Systems and Technical Resource Administrator CUTTINGEDGE / 90 Victoria St, West End, Brisbane, QLD, 4101 T + 61 7 3013 6200 M 0420 827 007 E cwright@cuttingedge.com.au | W www.cuttingedge.com.au /SYD /BNE /TYO -- This email is confidential and solely for the use of the intended recipient. If you have received this email in error please notify the author and delete it immediately. This email is not to be distributed without the author's written consent. Unauthorised forwarding, printing, copying or use is strictly prohibited and may be a breach of copyright. Any views expressed in this email are those of the individual sender unless specifically stated to be the views of Cutting Edge Post Pty Ltd (Cutting Edge). Although this email has been sent in the belief that it is virus-free, it is the responsibility of the recipient to ensure that it is virus free. No responsibility is accepted by Cutting Edge for any loss or damage arising in any way from receipt or use of this email. This email may contain legally privileged information and privilege is not waived if you have received this email in error.