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[Jim Rollenhagen <jim@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

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.

** Affects: nova
     Importance: Undecided
         Status: New


** Tags: liberty-rc-potential

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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):
  New

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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