[Engine-devel] Change in ovirt-engine[master]: core: enable to decrease DC compatibility...

[Livnat Peer]

On 03/23/2014 01:39 PM, Itamar Heim wrote:
> On 03/23/2014 01:13 PM, Livnat Peer wrote:
>> On 03/23/2014 01:10 PM, Itamar Heim wrote:
>>> On 03/23/2014 12:25 PM, Livnat Peer wrote:
>>>> On 03/23/2014 12:13 PM, Eli Mesika wrote:
>>>>>
>>>>> So, as far a I understand for resolving this bug the following is OK :
>>>>>
>>>>> Block downgrading if there are Hosts or Networks (other than the
>>>>> default management network) or SD in the DC when downgrading.
>>>>>
>>>>
>>>>
>>>> Why does having hosts should prevent us from downgrading the DC level?
>>>
>>> tomorrow you may have hosts which won't support an older cluster.
>>
>> Host are associated with a cluster, how can downgrading of DC level
>> impact the existing hosts? DC downgrade does not downgrade the clusters
>> level.
>>
> 
> well, you are kind of explaining why this can't happen...
> a DC can only be upgraded if all Clusters have already been upgraded.
> hence a DC can only be downgraded if it has no clusters, hence no hosts.
> (because to downgrade the DC, the clusters would have to be downgraded
> first, and you can't have a cluster lower than the DC...)

The only rule we enforce today is -

DC level <= Cluster level : for all clusters in the DC

Thus you can downgrade the DC with clusters in it with no effect on the
clusters or the hosts.
The clusters do not need to be downgraded.


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