How does OpenStack choose which compute node to use when starting an instance?

Solution In Progress - Updated -

Issue

  • With respect to a server being chosen for a virtual machine, what is stacking and spreading?
  • Does OpenStack spread or stack by default?
  • What are the benefits of stacking?
  • What are the benefits of spreading?
  • How do I tune to have stacking or spreading?
  • How do I empirically verify if OpenStack is stacking or spreading and debug if necessary?

Environment

  • Red Hat Enterprise Linux OpenStack Platform 4
  • Red Hat Enterprise Linux OpenStack Platform 5

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