Thanks Laurent. Sometimes the trick works and instances can migrate. We do not understand what is wrong when instances fail to migrate.

We are usung soft-anti-affinity policy.

The spec field we inserted in both cases seeems the same.

Ignazio.

Il Mer 6 Apr 2022, 01:03 Laurent Dumont <laurentfdumont@gmail.com> ha scritto:

I'm trying to find where else this was discussed, but afaik, this was never supported.

I am not sure if someone was able to "hack" it's way to a working setup. It's a bit of a shame because it makes server-groups really not flexible :(

On Tue, Apr 5, 2022 at 3:04 PM Ignazio Cassano <ignaziocassano@gmail.com> wrote:

Hello, we noted that instances can be inserted in server groups only at instance creation step but we need to insert in a server group some old instances.

We tried to modify database nova_api server group tables but we noted that we must modify spec in  request_specs table . For us is not clear how to modify the spec value. 

We tried to investigate looking at instances inserted in a server group at creation step and we got issues in instance live migration.

Please, anyone could provide any utility to do it or any template ?

Thanks

Ignazio