IMHO, this seems fit better of the availability since location is more about 
availability like power supply, network switch availability etc.

Or, what's the boundary of host aggregate and availability zone? Seems host 
aggregate is so magic that it can cover every requirement to separate/group the 
host, but also, because it's so magic, it's sure to require some other 
mechanism to help it to do the real separation/group.

Thanks
--jyh

From: Mike Spreitzer [mailto:mspre...@us.ibm.com]
Sent: Tuesday, October 01, 2013 6:53 AM
To: OpenStack Development Mailing List
Subject: Re: [openstack-dev] [nova] [scheduler] blueprint for host/hypervisor 
location information

Maybe the answer is hiding in plain sight: host aggregates.  This is a concept 
we already have, and it allows identification of arbitrary groupings for 
arbitrary purposes.
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