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[Joe Gordon <1378233@xxxxxxxxxxxxxxxxxx>]

Although this may be fine for your cloud, I don't think this is
desirable in the general case.

** Changed in: nova
       Status: Confirmed => Opinion

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https://bugs.launchpad.net/bugs/1378233

Title:
  Provide an option to ignore suspended VMs in the resource count

Status in OpenStack Compute (Nova):
  Opinion

Bug description:
  It would be very useful for our case scenario to be able to have an
  option that enables not counting suspended machines as consuming
  resources. The use case is having little memory available and still
  being able to launch new VMs when old VMs are in suspended mode. We
  understand that once the compute node's memory is full we won't be
  able to resume these machines, but that is OK with the way we're using
  our cloud.

  For example a compute node with 8G of RAM, launch 1 VM with 4G and
  another with 2G, then suspend them both, one could then launch a new
  VM with 4G of RAM (the actual memory on the compute node is free).

  On essex we had the following patch for this scenario to work :

  Index: nova/nova/scheduler/host_manager.py
  ===================================================================
  --- nova.orig/nova/scheduler/host_manager.py
  +++ nova/nova/scheduler/host_manager.py
  @@ -337,6 +337,8 @@ class HostManager(object):
               if not host:
                   continue
               host_state = host_state_map.get(host, None)
  +            if instance.get('power_state', 1) != 1: # power_state.RUNNING
  +                continue
               if not host_state:
                   continue
               host_state.consume_from_instance(instance)

  We're looking into patching icehouse for the same behaviour but would
  like to add it as an option this time.

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