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

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...)

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