> Environment setup:
>
> 3 Host HCI GlusterFS setup.  Identical hosts, Dell R720s w/ Intel E5-2690
> CPUs
>
> 1 default data center (4.2 compat)
> 1 default cluster (4.2 compat)
>
> Situation: I recently upgraded my three node HCI cluster from Ovirt 4.2 to
> 4.3.  I did so by first updating the engine to 4.3 then upgrading each
> ovirt-node host to 4.3 and rebooting.
>
> Currently engine and all hosts are running 4.3 and all is working fine.
>
> To complete the upgrade I need to update cluster compatibility to 4.3 and
> then data centre to 4.3.  This is where I am stuck.
>
> The CPU type on cluster is "Intel SandyBridge IBRS Family".  This option is
> no longer available if I select 4.3 compatibility.  Any other option chosen
> such as SandyBridge IBRS SSBD will not allow me to switch to 4.3 as all
> hosts must be in maintenance mode (which is not possible w/ self hosted
> engine).
>
> I saw another post about this where someone else followed steps to create a
> second cluster on 4.3 with new CPU type then move one host to it, start
> engine on it then perform other steps to eventually get to 4.3
> compatibility.
>

I have the exact same hardware configuration and was able to change to "SandyBridge IBRS SSBD" without creating a new cluster.  How I made that happen, I'm not so sure, but the cluster may have been in "Global Maintenance" mode when I changed it.


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