[ovirt-users] Re: Changing CPU type from Opteron G3 to Epyc with hosted engine in 4.3

On Wed, Feb 6, 2019 at 5:21 AM Juhani Rautiainen < juhani.rautiainen(a)gmail.com&gt; wrote: You can simply upgrade the cluster if all the hosts are in global maintenance mode. The only case that could prevent that is that you are in hosted-engine mode and so you cannot set the latest host into maintenance mode without loosing the engine itself. If this is your case, what you can do is: - set HE global maintenance mode - set one of the hosted-engine hosts into maintenance mode - move it to a different cluster - shutdown the engine VM - manually restart the engine VM on the host on the custom cluster directly executing on that host: hosted-engine --vm-start - connect again to the engine - set all the hosts of the initial cluster into maintenance mode - upgrade the cluster - shut down again the engine VM - manually restart the engine VM on one of the hosts of the initial cluster - move back the host that got into a temporary cluster to its initial cluster