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[Alan Pevec <1305897@xxxxxxxxxxxxxxxxxx>]

** Also affects: nova/juno
   Importance: Undecided
       Status: New

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https://bugs.launchpad.net/bugs/1305897

Title:
  Hyper-V driver failing with dynamic memory due to virtual NUMA

Status in OpenStack Compute (nova):
  Fix Released
Status in OpenStack Compute (nova) juno series:
  New

Bug description:
  Starting with Windows Server 2012, Hyper-V provides the Virtual NUMA
  functionality. This option is enabled by default in the VMs depending
  on the underlying hardware.

  However, it's not compatible with dynamic memory. The Hyper-V driver
  is not aware of this constraint and it's not possible to boot new VMs
  if the nova.conf parameter 'dynamic_memory_ratio' > 1.

  The error in the logs looks like the following:
  2014-04-09 16:33:43.615 18600 TRACE nova.virt.hyperv.vmops HyperVException: WMI job failed with status 10. Error details: Failed to modify device 'Memory'.
  2014-04-09 16:33:43.615 18600 TRACE nova.virt.hyperv.vmops
  2014-04-09 16:33:43.615 18600 TRACE nova.virt.hyperv.vmops Dynamic memory and virtual NUMA cannot be enabled on the same virtual machine. - 'instance-0001c90c' failed to modify device 'Memory'. (Virtual machine ID F4CB4E4D-CA06-4149-9FA3-CAD2E0C6CEDA)
  2014-04-09 16:33:43.615 18600 TRACE nova.virt.hyperv.vmops
  2014-04-09 16:33:43.615 18600 TRACE nova.virt.hyperv.vmops Dynamic memory and virtual NUMA cannot be enabled on the virtual machine 'instance-0001c90c' because the features are mutually exclusive. (Virtual machine ID F4CB4E4D-CA06-4149-9FA3-CAD2E0C6CEDA) - Error code: 32773

  In order to solve this problem, it's required to change the field
  'VirtualNumaEnabled' in 'Msvm_VirtualSystemSettingData' (option
  available only in v2 namespace) while creating the VM when dynamic
  memory is used.

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