Instance migration fails when using cpu-pinning from a numa-cell and flavor-property "hw:cpu_policy=dedicated"

Solution Verified - Updated -


  • We are having migration failures. The procedure was from section 3. "Migrate between hypervisors" (not a live migration).
  • The VM is shutdown before migrate procedure from article
  • The error message is as follows:
#  nova migrate --poll $u
ERROR (BadRequest): No valid host was found. No valid host found for cold
migrate (HTTP 400) (Request-ID: req-592d59db-9185-4775-b5e2-940aa657a62c)
  • If however one VM is in shut off (on the destination host), then the other VM migration will succeed and the VM will come into service; for example, VM2 migrated from Host10 to Host03 while VM1 was shut off. However VM1 is no longer able to come into service as VM2 is using some of the same dedicated VCPUs.
  • Here is what you get when trying to power on the second VM that has VCPU collision with first one:
2016-02-16 17:30:49.860 58352 INFO nova.compute.resource_tracker
[req-9922b49b-c3e7-491f-b400-fa711b99eee1 - - - - -] Auditing locally available
compute resources for node mme06-host10
2016-02-16 17:30:50.806 58352 ERROR nova.openstack.common.periodic_task
[req-9922b49b-c3e7-491f-b400-fa711b99eee1 - - - - -] Error during
ComputeManager.update_available_resource: Cannot pin/unpin cpus [0, 1, 2, 3, 4,
5, 7, 8, 9, 20, 21, 22, 23, 24, 25, 27, 28, 29] from the following pinned set
[0, 1, 5, 8, 9, 20, 21, 25, 28, 29]
  • It happens whenever the VCPU usage overlaps the usages already present in the possible destinations.


  • Red Hat OpenStack 7.0 or later

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