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

Craig Jellick cjellick at godaddy.com
Thu Oct 23 19:15:54 UTC 2014

Thanks Joe, that is very helpful.

/Craig J

From: Joe Topjian <joe at topjian.net<mailto:joe at topjian.net>>
Date: Thursday, October 23, 2014 at 10:42 AM
To: Craig Jellick <cjellick at godaddy.com<mailto:cjellick at godaddy.com>>
Cc: "openstack at lists.openstack.org<mailto:openstack at lists.openstack.org>" <openstack at lists.openstack.org<mailto:openstack at lists.openstack.org>>, "openstack-operators at lists.openstack.org<mailto:openstack-operators at lists.openstack.org>" <openstack-operators at lists.openstack.org<mailto:openstack-operators at lists.openstack.org>>
Subject: Re: [Openstack-operators] [nova] instance resource quota quesetions

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 affected.

Hope that helps,

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

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

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