[openstack-dev] Next steps for Whole Host allocation / Pclouds

Mike Spreitzer mspreitz at us.ibm.com
Tue Jan 21 14:54:04 UTC 2014

I want to explore the linkage between the proposed exclusive use filter 
and scheduling a little more.  At the Icehouse summit I heard the concern 
that without advance preparation, there may well be zero hosts that are 
acceptable.  Why is that not a concern now?

What does the Nova scheduler do now about maintaining a pool of completely 
unused hosts?

Does Nova regularly migrate VMs in order to achieve some policy of 
maintaining unused hosts, or some other sort of balance?

Does nova-boot now migrate VMs in the case where the only possible 
packings require moving existing VMs?

Is migration really so non-disruptive to the VM's user that Nova can do it 

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