Il dom 8 apr 2018, 08:44 Arik Hadas <aha...@redhat.com> ha scritto:

>
>
> On Fri, Apr 6, 2018 at 12:28 PM, Luca 'remix_tj' Lorenzetto <
> lorenzetto.l...@gmail.com> wrote:
>
>> On Fri, Apr 6, 2018 at 11:05 AM, Michal Skrivanek
>> <michal.skriva...@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.
>

Fantastic. Thanks for the explanation. I like to have a better knowledge of
what happens behind the scenes, because helps me to solve problems when
they appear.

Luca


>
>>
>> Luca
>>
>>
>>
>> --
>> "E' assurdo impiegare gli uomini di intelligenza eccellente per fare
>> calcoli che potrebbero essere affidati a chiunque se si usassero delle
>> macchine"
>> Gottfried Wilhelm von Leibnitz, Filosofo e Matematico (1646-1716)
>>
>> "Internet è la più grande biblioteca del mondo.
>> Ma il problema è che i libri sono tutti sparsi sul pavimento"
>> John Allen Paulos, Matematico (1945-vivente)
>>
>> Luca 'remix_tj' Lorenzetto, http://www.remixtj.net , <
>> lorenzetto.l...@gmail.com>
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>
>
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