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

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

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https://bugs.launchpad.net/bugs/1502177

Title:
  Existing Ironic instances report negative available RAM for the node
  after upgrade

Status in OpenStack Compute (nova):
  Fix Released

Bug description:
  Ironic nodes that have an existing instance will report negative
  available RAM after upgrading beyond this commit:
  https://github.com/openstack/nova/commit/b99fb0a51c658301188bbc729d1437a9c8b75d00

  The node attached to the instance will not have
  instance_info[memory_mb], etc, set on the node object in Ironic. This
  code causes the driver to report memory_mb_used=memory_mb=0 if this
  info is unset. The resource tracker notices that an instance is on
  that node and sets memory_mb_used to X (the size of the instance).
  After which the node reports (-X) available memory.

  This can wreak havoc on tools that look at total available memory.
  These could range from capacity reporting tools to scheduler/cells
  filters. If more than half of the capacity has instances, the total
  memory available will be negative, and could cause things to not
  schedule properly or generate alerts.

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