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[Aseel Awwad <1753226@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

The live migration operation for a VM with 40 VCPUs to the compute host
with 20 free VCPUS was done successfully althoug cpu_allocation_ratio is
1. While the creation of 40 VCPU VM fails with Insufficient compute
resources: Free vcpu -20.00 VCPU < requested 40 VCPU. After making code
inspection in the Nova service. It seems that the live migration process
doesn't check for the available resources  and compare them with the
required resources. While in the instance create process, there is a
check for that.

** Affects: nova
     Importance: Undecided
     Assignee: Aseel Awwad (aseelawwad)
         Status: New

** Changed in: nova
     Assignee: (unassigned) => Aseel Awwad (aseelawwad)

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https://bugs.launchpad.net/bugs/1753226

Title:
  Oversubscribe with live-migration

Status in OpenStack Compute (nova):
  New

Bug description:
  The live migration operation for a VM with 40 VCPUs to the compute
  host with 20 free VCPUS was done successfully althoug
  cpu_allocation_ratio is 1. While the creation of 40 VCPU VM fails with
  Insufficient compute resources: Free vcpu -20.00 VCPU < requested 40
  VCPU. After making code inspection in the Nova service. It seems that
  the live migration process doesn't check for the available resources
  and compare them with the required resources. While in the instance
  create process, there is a check for that.

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