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

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

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

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https://bugs.launchpad.net/bugs/1267862

Title:
  launch a new vm fail in source host after live migration

Status in OpenStack Compute (Nova):
  Fix Released

Bug description:
  Nova version：Havana

  We have two compute nodes: Host A and Host B. Each one have 100G disk,
  4 cpus and 2G mem for example.

  First, launch an image-backed instance named vm-1 in Host A using the
  flavor successfully. The flavor's specs is 60G disk, 2cpus and 1G mem.
  So, obviously the free resource on Host A is 40G disk, 2 cpus and 1
  mem.

  Second, doing live migration with block migation flag from Host A to
  Host B.Then success. Now, no active instance exist on Host A.

  But, the problem is the free resource on Host A is still 40G disk, 2
  cpu and 1G mem. The resource described in compute_nodes table don't
  add back.

  Then adding another new instance named vm-2 to Host A using same
  flavor as vm-1. We are notified that resource is insuffieint on Host
  A.(40G<60G disk denied)

  Notice that the data would be correct after next priodic task of
  update_available_resource. Wihin the interval time, it means we can't
  deploy another instance, but it can be in fact.

  I think the resource should be recaculate immediatly on Host A,
  otherwise it may affects vm delpoyment.

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