Open Stack

On 7/25/2019 7:50 AM, Budai Laszlo wrote:
> Can you please clarify one more thing: how is the resize involved in this cold migration. Apparently it is trying to resize before it would copy the files. Is there any document that describes the steps of the migration?

Resize and cold migration are the same flow under the covers, the only 
difference being a resize has a new flavor while a cold migration does 
not (and for the libvirt driver you can't cold migrate to the same host 
like a resize).

I don't think we have a reference doc on the low-level resize / cold 
migration flow like we have for live migration [1] (we should add one 
though, I could probably sketch it out pretty quickly if someone can 
throw it into the docs). I did find this pretty old blog [2] that might 
help - note it's from 2014 though so parts of it might be inaccurate by now.

[1] https://docs.openstack.org/nova/latest/reference/live-migration.html
[2] 
http://bodenr.blogspot.com/2014/03/openstack-nova-vm-migration-live-and.html

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Thanks,

Matt