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[Diko Parvanov <1975490@xxxxxxxxxxxxxxxxxx>]

Public bug reported:

A live-migration of a VM with 8 vCPUs from host SOURCE to host DEST,
where host SOURCE has no free vCPUs will fail, because it will require
that host SOURCE has 8 vCPUs together with the already allocated 8 vCPUs
from the running instance, so it requires the source host to have 16
vCPUs.

The workaround is to increase the allocation ratio of the host SOURCE
via openstack resource provider inventory class set --allocation_ratio
and then scale it back down to the required value.

** Affects: nova
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1975490

Title:
  Live migration of instances requires the destination AND the source to
  have the same resources free on top of what the instance is taking

Status in OpenStack Compute (nova):
  New

Bug description:
  A live-migration of a VM with 8 vCPUs from host SOURCE to host DEST,
  where host SOURCE has no free vCPUs will fail, because it will require
  that host SOURCE has 8 vCPUs together with the already allocated 8
  vCPUs from the running instance, so it requires the source host to
  have 16 vCPUs.

  The workaround is to increase the allocation ratio of the host SOURCE
  via openstack resource provider inventory class set --allocation_ratio
  and then scale it back down to the required value.

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