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[Thierry Carrez <thierry.carrez+lp@xxxxxxxxx>]

** Changed in: nova
       Status: Fix Committed => Fix Released

** Changed in: nova
    Milestone: None => havana-3

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https://bugs.launchpad.net/bugs/968175

Title:
  Quota update should not allow negative headroom

Status in OpenStack Compute (Nova):
  Fix Released

Bug description:
  Currently quotas can be reduced to below the current usage level for
  that resource type, giving negative headroom which seems to me non-
  sensical.

  Was this intended as a deliberate way to "softly" reduce resource
  usage? i.e. to cause the in use count to slowly approach the new
  quotas as resources are released as part of their natural lifecycle,
  e.g. when instances are eventually delete'd, new instances cannot be
  spun up to replace them.

  This however seems a very unreliable way of reducing reducing usage
  retrospectively, as the resources in question may be held onto
  indefinitely. A more reliable approach would be to force the release
  of the excess resource *before* the quota is reduced.

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