8:21 a.m.
New subject: Host choice when migrating VMs
Le 22/02/2019 à 15:02, Karli Sjöberg a écrit :
Den 22 feb. 2019 09:24 skrev Nicolas Ecarnot <nicolas(a)ecarnot.net>:
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.
Hi Karli,
Hosts _needs_ the same networks to be available in the same cluster.
Correct me if I'm wrong, but I think that your statement is true *if*
the networks are set as mandatory, which is not automatically wanted nor
true. In our case, we have to disable this mandatory attribute.
I agree that when the networks are mandatory, every host unable to use
them will end up unavailable.
Different networked hosts needs to be put in a separate cluster.
/K
--
Nicolas ECARNOT
8:35 a.m.
New subject: Host choice when migrating VMs
On Fri, 22 Feb 2019 15:02:10 +0100 (CET)
Karli Sjöberg <karli(a)inparadise.se> wrote:
Den 22 feb. 2019 09:24 skrev Nicolas Ecarnot <nicolas(a)ecarnot.net>:
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.
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/7d111f3aa089f77f92049f4d3ec792...
/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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2 comments
3 participants
participants (3)
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Dominik Holler -
Karli Sjöberg -
Nicolas Ecarnot