On Fri, Apr 6, 2018 at 12:28 PM, Luca 'remix_tj' Lorenzetto <lorenzetto.luca@gmail.com> wrote:

On Fri, Apr 6, 2018 at 11:05 AM, Michal Skrivanek
<michal.skrivanek@redhat.com> wrote:
>
> you just need to keep the supported versions in mind. Version 4.2 supports
> Cluster levels 3.6, 4.0, 4.1(same as version 4.1) - so any of them is ok
>

Perfect, thank you for the confirmation.

To change the compatibility level of DC, i've seen that all clusters
require has to be upgraded.
Does the upgrade of the DC requires the restart of all the VMs to have
the cluster completely upgraded or restarting the VMs is an activity
indipendent from this?

You won't have to restart the running VMs.

You'll see that VMs that were running at the time of the cluster upgrade are set with custom-compatibility-version that matches the previous compatibilty-level of the cluster. So obviously, VM-specific features that were added in 4.2 won't be applicable to those VMs until they are restarted (and then their custom-compatibility version is cleared so their effective compability-level would change to 4.2).

But even when some VMs are set with custom-compatibility-version, the cluster is upgraded and so it should be possible to upgrade the DC.

 

Luca

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Luca 'remix_tj' Lorenzetto, http://www.remixtj.net , <lorenzetto.luca@gmail.com>
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