[Openstack] [Openstack-operators] [nova] instance resource quota quesetions

Joe Topjian joe at topjian.net
Thu Oct 23 17:42:03 UTC 2014

I can confidently say that throttling will work with KVM. I think both
virt_types will work since libvirt is controlling everything in the end.

One caveat about IO throttling to keep in mind is that the Nova settings
are not applied to volumes -- just the root and ephemeral disk. We were
unable to verify if IO throttling through Cinder worked due to this bug:


For bandwidth, I want to say that it is agnostic to nova-network and
Neutron since it happens at the libvirt layer, but I am not 100% sure as
I've never tested the settings on both.

It's safe to test these settings live (IMO). If you figure out the correct
"virsh" commands to use to apply the settings, you can run them directly on
the compute node against a test instance and no other instances will be

Hope that helps,

On Thu, Oct 23, 2014 at 11:20 AM, Craig Jellick <cjellick at godaddy.com>

>  Hello,
>  I have a few questions regarding the instance resource quota feature in
> nova which is documented here:
> https://wiki.openstack.org/wiki/InstanceResourceQuota
>  First, the section on disk IO states "IO throttling are handled by
> QEMU.” Does this mean that this feature only works when the hypervisor is
> QEMU (virt_type = QEMU in nova.conf) or will this feature work with KVM?
>  Second, this feature also allows control over network bandwidth. Will
> that work if you are using neutron or does it only work if you’re using
> nova-network? Our setup is neutron w/ ml2+ovs with the ovs agent living on
> each compute node.
>  /Craig J
> _______________________________________________
> OpenStack-operators mailing list
> OpenStack-operators at lists.openstack.org
> http://lists.openstack.org/cgi-bin/mailman/listinfo/openstack-operators
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