On Sat, Feb 9, 2019 at 1:05 AM Vinícius Ferrão
<ferrao@versatushpc.com.br> wrote:
>
> Hello,
>
> For reasons unknown during oVirt 4.2 -> 4.3 my CPU type was Broadwell IBRS and because of this I can’t upgrade the datacenter to 4.3. The problem was that on 4.3 theres only Broadwell IBRS SSBD and Broadwell.
>
> So the only way to up the cluster to 4.3 was to downgrade to plain Broadwell.
>
> Now I can’t upgrade it Broadwell IBRS SSBD.

>
> So, how can I upgrade it back?

There has been lot's of discussion about that this week. I had same
problem with Opteron G3->Epyc conversion. There steps were suggested
to me and they worked and you problem is similar:

- 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

As first step I would add that you create new cluster which already
has 4.3 level and CPU Type you want so already can check if cluster
accepts nodes.

-Juhani
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