I have two groups of hosts as compute nodes: BigGroup: a few machines with very big RAM SmallGroup: a lot of machines with smaller RAM each. My goal is to assigne bigger instances (from bigger flavors) to BigGroup and smaller instances to SmallGroup. I tried the "AggregateInstanceExtraSpecsFilter" filtering with assigning different keys to instances and making aggregated hosts (http://docs.openstack.org/folsom/openstack-compute/admin/content/host-aggregates.html), but didn't work and all the instance boots will end up to error. Any idea? More over does anyone know how can I assign higher cost to bigger nodes for weighting? Thanks, -------------- next part -------------- An HTML attachment was scrubbed... URL: <http://lists.openstack.org/pipermail/openstack-operators/attachments/20130702/6fb8fbaf/attachment.html>