[openstack-dev] [Nova] why don't we deal with "claims" when live migrating an instance?

Brian Elliott bdelliott at gmail.com
Thu Jan 16 15:54:33 UTC 2014

On Jan 15, 2014, at 4:34 PM, Clint Byrum <clint at fewbar.com> wrote:

> Hi Chris. Your thread may have gone unnoticed as it lacked the Nova tag.
> I've added it to the subject of this reply... that might attract them.  :)
> Excerpts from Chris Friesen's message of 2014-01-15 12:32:36 -0800:
>> When we create a new instance via _build_instance() or 
>> _build_and_run_instance(), in both cases we call instance_claim() to 
>> reserve and test for resources.
>> During a cold migration I see us calling prep_resize() which calls 
>> resize_claim().
>> How come we don't need to do something like this when we live migrate an 
>> instance?  Do we track the hypervisor overhead somewhere in the instance?
>> Chris

It is a good point and it should be done.  It is effectively a bug.


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