Open Stack

I have begun drafting a blueprint about more detailed host/hypervisor 
location information, to support the sort of policy-informed placement 
decision-making that Debo, Yathi, and I have been talking about.  The 
blueprint is at 
https://blueprints.launchpad.net/nova/+spec/hypervisor-location-attribute 
and the details are at 
https://wiki.openstack.org/wiki/Nova/HypervisorExtendedAttributes

You see I am a little schizophrenic here about scope.  The blueprint is 
named quite narrowly, and the details page is named more broadly; this is 
because I am not sure what else you folks will chime in with.

I am not sure whether this information should really be attached to a 
hypervisor or to a host.  I proposed hypervisor because currently the 
details for a hypervisor are a map (easily extended) whereas the details 
for a host are currently a list of uniformly-typed contents (not so easily 
extended).  But host might actually be more appropriate.  I am looking for 
feedback on whether/how to go that way.  BTW, where would I find 
documentation on host details?  The current page on nova extensions (
http://docs.openstack.org/api/openstack-compute/2/content/ext-compute.html
) is lacking most of them.

You will see that I have proposed what the API looks like, but not the 
source of this additional information.  I will ask my colleagues who have 
something like this locally, how they got it done and what they would 
recommend to OpenStack.  Perhaps you good folks have some suggestions.  Is 
there obviously one way to do it?  Is it obvious that there can be no one 
way and so a plug point is required?

Thanks,
Mike
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