On Fri, 22 Feb 2019 15:46:00 +0100 (CET)
Karli Sjöberg wrote:

>
>
> Den 22 feb. 2019 15:35 skrev Dominik Holler :
> On Fri, 22 Feb 2019 15:02:10 +0100 (CET)
> > Karli Sjöberg wrote:
> >
> > >
> > >
> > > Den 22 feb. 2019 09:24 skrev Nicolas Ecarnot :
> > > Hello,
> > > >
> > > > I'm almost sure the following is useless as I think I know how it's
> > > > working, but as I'm preparing a major change in our infrastructure, I'd
> > > > rather be sure and not mess up. And also to be sure.
> > > > (Just to be sure)
> > > >
> > > > For some reasons, and for the first time in our infra., one of our new
> > > > DC will temporary include heterogeneous hosts : some networks will be
> > > > available only on parts of them.
> > > >
> >
> > Should work.
> >
> > > Hosts _needs_ the same networks to be available in the same cluster. Different networked hosts needs to be put in a separate cluster.
> > >
> >
> > This is the most straight approach, which is supported by oVirt.
> > But there is the possibility to attach logical networks, which are
> > neither required in the cluster, nor attached to all hosts in the
> > cluster, to a VM. oVirt's scheduling will respect this.
> >
> So you're saying oVirt knows which other hosts in the cluster have the non-mandatory network(s) the VM has and only chooses between those a host to migrate the VM to?
>

Yes. If you try to trigger the migration manually, UI will provide you
the list of possible hosts to migrate the VM.

> /K
>
> Of course this introduces some obvious limitations, e.g. you cannot
> > hotplug a network to a VM, which runs on a host, which is not connected
> > to this network or neither you nor oVirt can schedule a VM to a host,
> > which does not provide all the networks attached to the VM.
> >
> > If you want to be even more sure, the reference to the relevant source
> > https://github.com/oVirt/ovirt-engine/blob/7d111f3aa089f77f92049f4d3ec792e5ff7e5324/backend/manager/modules/bll/src/main/java/org/ovirt/engine/core/bll/scheduling/policyunits/NetworkPolicyUnit.java#L132
> >
> >
> > > /K
> > >
> > >
> > > > Please may someone confirm me that with every load balancing / VM
> > > > startup / VM migration / host choice, oVirt will smartly choose the
> > > > available host equipped with the adequate networks?
> > > >
> > > > --
> > > > Nicolas ECARNOT
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> > > >
> >
> >