<font size=2 face="sans-serif">Debo, Yathi: I have read </font><a href="https://docs.google.com/document/d/1IiPI0sfaWb1bdYiMWzAAx0HYR6UqzOan_Utgml5W1HI/edit?pli=1"><font size=2 face="sans-serif">https://docs.google.com/document/d/1IiPI0sfaWb1bdYiMWzAAx0HYR6UqzOan_Utgml5W1HI/edit?pli=1</font></a><font size=2 face="sans-serif">
and most of the referenced materials, and I have a couple of big-picture
questions. That document talks about making Nova call out to something
that makes the sort of smart decisions you and I favor. As far as
I know, Nova is still scheduling one thing at a time. How does that
smart decision maker get a look at the whole pattern/termplate/topology
as soon as it is needed? I think you intend the smart guy gets it
first, before Nova starts getting individual VM calls, right? How
does this picture grow to the point where the smart guy is making joint
decisions about compute, storage, and network? I think the key idea
has to be that the smart guy gets a look at the whole problem first, and
makes its decisions, before any individual resources are requested from
nova/cinder/neutron/etc. I think your point about "non-disruptive,
works with the current nova architecture" is about solving the problem
of how the smart guy's decisions get into nova. Presumably this problem
will occur for cinder and so on, too. Have I got this right?</font>
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<br><font size=2 face="sans-serif">There is another way, right? Today
Nova accepts an 'availability zone' argument whose value can specify a
particular host. I am not sure about Cinder, but you can abuse volume
types to get this job done.</font>
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<br><font size=2 face="sans-serif">Thanks,</font>
<br><font size=2 face="sans-serif">Mike</font>