[ovirt-users] Affinity

[Koen Vanoppen]

Thanks for your reply. But I maybe explained it badly... All the 4
hypervisors are in the same Datacenter on oVirt. But they are physically in
a different datacenter.
That is why I want to force them to run on a different hypervisor. IF 1
physical datacenter would go down (electricity power failure or whatever)
At least one VM will continue to run.

2015-01-05 10:21 GMT+01:00 Doron Fediuck <dfediuck at redhat.com>:

>
> On 05/01/15 10:54, Koen Vanoppen wrote:
>
>      Hi All,
>
>  First of all, let me say a Happy New Year with all the best wishes!!
>
>  Now, let's get down to business :-).
>
>  I would lik eto implement the Affinity option in our datacenter.
>  I already activated it, put the 2 vms in it and set in on negative so
> they won't run together on the same hypervisor. Now, the question...
>  Is there a way I can force the VM's so they will run on a hypervisor that
> is not in the same datacenter? We have this;
>
>  Hyp1 -> Datacenter1
>  Hyp2 -> Datacenter2
> Hyp3 -> Datacenter1
> Hyp4 -> Datacenter2
>
>  For the moment they run on a different Hypervisor, but they are in the
> same Datacenter. I can manually now move them to the other one, but I would
> like this that oVirt manages this...
>  Is this possible...?
>
>  Kind regards,
>
> Koen
>
>
>  Hi Koen.
>
> VMs cannot move between data centers while still running.
> Just to provide some basic concepts in terms of hierarchy, we have:
>
> Data-Center1
> |
> |\ Cluster A
> | |
> | |\ Host (a)
> | |\ Host (b)
> |
> |\ Cluster B
> | |
> | |\ Host (c)
> | |\ Host (d)
> | |\ Host (e)
>
> Data-Center2
> |
> |\ Cluster A
> | |
> | |\ Host (f)
> |
> |\ Cluster B
> | |
> | |\ Host (g)
> | |\ Host (h)
> | |\ Host (i)
>
> As you can see, a host may be a part of a single cluster and a VM
> will run on one of the hosts. Live migration can be done between
> hosts of the same cluster. The only way to move VM between clusters
> and DCs are when the VM is down, in a manual way.
>
> So Affinity works in the cluster level, and the rules are valid for a
> specific cluster who currently owns the VM.
> In your case if Hyp1 and Hyp3 belong to the same cluster, the affinity
> rules will apply every time you start or migrate a VM. However, there's
> no rule which is valid for Datacenter1 and Datacenter2.
>
> HTH,
> Doron
>
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