Open Stack

There are two settings we've tweaked in the past in Nova.

shuffle_best_same_weighed_hosts  --> Allow more spreading in the case of
computes with the exact same specs/weights.
host_subset_size --> Helps with concurrent requests to get different hosts

Before that, we saw the same behavior with Openstack stacking VM on single
computes. It still respects anti-affinity, but I don't see a good reason to
not spread as a default. Changing these two was enough to allow our spread
to get a little better.

On Tue, Feb 15, 2022 at 11:19 AM Franck VEDEL <
franck.vedel at univ-grenoble-alpes.fr> wrote:

> Hello,
> I seem to have a problem that I hadn't seen.
> I have 3 servers for my openstack, built with Kolla-ansible, I'm in
> Victoria version.
> I had simply put the 3 servers in the [compute] part of the multinode
> file, at first it worked, but for some time all the VMs are placed on
> server 1.
>
> The 3 servers are operational, identical. here are 3 screenshots to show
> it. (on the images, the instances on servers 2 and 3 are present because it
> worked correctly, but no more instances are created on these servers now)
>
>
> I tried to understand how the instances are distributed on the servers,
> but in my case, I don't understand why none are assigned to the 2nd and 3rd
> server.
> How to find the problem? It should be nova-scheduler . Do you have to do
> anything special? Go see if a parameter has a bad value?
>
>
> Thanks in advance if you can help me.
>
> Franck VEDEL
>
>
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