[nova] live migration with the NUMA topology

Brin Zhang(张百林) zhangbailin at inspur.com
Thu Dec 12 13:24:11 UTC 2019

Hi folks::

       About http://specs.openstack.org/openstack/nova-specs/specs/train/approved/numa-aware-live-migration.html this spec in Train.

I have a question, if the destination server's NUMA topology (e.g. nume_node=2) < source server's NUMA topology (e.g. numa_noed=4) in a instance. If I am living migration *this* instance, what will be happened? Rollback and keep the instance to the original status? Or make it to ERROR? In that SPEC I had not find the details about the red description in "Third, information about the instance’s new NUMA characteristics needs to be generated on the destination (an InstanceNUMATopolgy object is not enough, more on that later)", or lack of careful reading :). Anyway, I want to know how to deal with this NUMA topology during live migration?


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