Yes you could use affinity labels, can you remove hosts without breaking affinity? I had to set the affinity to soft/not enforcing when doing maintenance on hosts.

The only way to bulk add hosts is via the API/SDK.

The easiest would be ansible.

https://docs.ansible.com/ansible/latest/modules/ovirt_affinity_group_module.html#ovirt-affinity-group-module


https://docs.ansible.com/ansible/latest/modules/ovirt_affinity_label_module.html#ovirt-affinity-label-module



Regards,
                  Paul S.
From: Alan G <alan+ovirt@griff.me.uk>
Sent: 28 July 2020 13:02
To: Nardus Geldenhuys <nardusg@gmail.com>
Cc: Staniforth, Paul <P.Staniforth@leedsbeckett.ac.uk>; users@ovirt.org <users@ovirt.org>
Subject: Re: [ovirt-users] Re: affinity/pool/fencing ?
 

Caution External Mail: Do not click any links or open any attachments unless you trust the sender and know that the content is safe.

You might find affinity labels are a better fit in this use case. It would allow you to add/remove/move hosts in the future much more quickly than hard coding affinity. But that still leaves the bulk configuration tasks.

The only way to do this quickly is with the REST API or one of the SDKs that leverage it.

You'd create the affinity labels in the web UI then assign the VMs using the API.


---- On Tue, 28 Jul 2020 12:43:43 +0100 Nardus Geldenhuys <nardusg@gmail.com> wrote ----

Hi Paul

Thanks for the response, easy way to add 100 VM's in your second step ?

Regards

Nar

On Tue, 28 Jul 2020 at 13:17, Staniforth, Paul <P.Staniforth@leedsbeckett.ac.uk> wrote:
Hello Nar,
                   you can achieve this with 2 affinity rules, a positive and negative one.

In the cluster create the first affinity group VM affinity rule disabled HOST affinity rule positive  set enforcing mode. Then add the VMs and 2 Hosts to force them to run on these hosts.

In the cluster create the second affinity group VM affinity rule disabled  HOST affinity rule negative set enforcing mode. Then add the rest of the VMs and the 2 Hosts to force them not to run on these hosts.



Regards,

                 Paul S.



From: Nardus Geldenhuys <nardusg@gmail.com>
Sent: 28 July 2020 11:22
To: users@ovirt.org <users@ovirt.org>
Subject: [ovirt-users] affinity/pool/fencing ?
 

Caution External Mail: Do not click any links or open any attachments unless you trust the sender and know that the content is safe.

Hi oVirt land

Hope you are well. Don't even know what to call this. But let me describe what I want to achieve.

We have a cluster with say 100 vm's. But we want two use two hosts in the cluster two run only certain VM's. I think you can do that with affinity rules. But how can I restrict those two hosts to only run the VM's, meaning that no other VM's will run on them.

I don't want to go and edit the 100 other VM's to not run on 2 hosts. Is there an easy way for doing this?

Oracle VM uses pools, I dont know what vmware uses.

Any advice will help.

Regards

Nar
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