[ovirt-users] compatibility relationship between datacenter, ovirt and cluster

[Tamer Lima]

ok, Itamar,  thanks.

now I can understand how the things work.

but I have a question based on the fact that  I have ovirt-engine on
version 3.4  and DC and Cluster both are configured on version 3.3 :

- This means that I have "available" features on version 3.4 , but these
features just will work when I update DC and Cluster to version 3.4   ?
(this is what I understand, following  Dafna Ron response)

so, to really obtain the benefits of the new version (3.4)  I need to run
the commands (yum update ovirt-engine-setup, engine-setup) and also
increase the version of compatibility within the datacenter, cluster and
host to the version 3.4


- and what I have if only update ovirt-engine  to version 3.4 and not
update dc, cluster neither hosts.
I realized changes on ovirt web admin interface,  improvements on icons and
maybe new fields.



On Fri, Apr 11, 2014 at 9:56 AM, Itamar Heim <iheim at redhat.com> wrote:

> On 04/10/2014 10:50 PM, Tamer Lima wrote:
>
>> Hi,
>>
>>
>> yesterday my ovirt was 3.3
>> my datacenter and cluster (compatibility version) was aligned with ovirt
>> 3.3
>>
>>
>> today my ovirt is now 3.4.
>> and my datacenter and cluster (compatibility version) remains 3.3  (with
>> the option enabled to change for 3.4)
>>
>> browsing the ovirt admin page I see 2 occurrences of ovirt version:
>> datacenter tab  = 3.3
>> cluster tab  =3.3
>>
>>
>>
>> I would like to understand what means all these versions, the same
>> version for a lot of important things, and how my ovirt works/behaves
>> using different versions.
>>
>> all my doubts together :
>> What means datacenter in version 3.3(or lower version) when ovirt is 3.4
>>  ?
>> what means cluster in version 3.3 when ovirt is 3.4?
>> what means change the "compatibility version" for datacenter?
>> what means change the "compatibility version" for cluster?
>>
>
> Gianluca replied with links for specific features.
> I'll reply on the general concept:
> - a host can be upgraded to a specific 3.x version. it can be in any
>   3.y cluster which is <= 3.x
>   once the host is upgraded, 3.x host-level features can be used
> - a cluster can be upgraded to 3.x once all active hosts in it are at
>   least with 3.x.
>   once the cluster is upgraded, 3.x cluster-level features can be used
> - a data cetner can be upgaeded to 3.x once all clusters in it are at
>   least with 3.x
>   once the DC is upgraded, 3.x DC-level features can be used
>
> i don't think we have it clearly documented per feture if it is host
> level, cluster level or DC level. when in doubt, ask...
>
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