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Best practice is to use shared storage and then the "copy" is really only
the active memory. A few changes came about in about the newton? timeframe
that allows for some memory convergence.

Take a look at the nova release notes from that time forward and you should
see reference to the change(s).

You likely won't get much more detail without providing a lot more detail
about your environment (and maybe not even then.) This functionality is
very dependent on your specific configuration regarding:
storage design
hypervisor choice
and is also very dependent upon
network load
network bandwidth
VM size
VM busy-ness
network design
nova structure (regions AZs, etc.)

-dave

On Wed, Mar 21, 2018 at 1:35 PM, Torin Woltjer <torin.woltjer at granddial.com>
wrote:

> I can't find any up to date official documentation on the topic, and only
> find documentation referring to the commands used. What is the best
> practice for setting up live migration for nova? I have used live migration
> over SSH in the past, but the documentation for how to do so is lost to me.
> Also there is live migration over TCP, is this preferable to ssh and how
> would you set it up. What are any general best practices for doing this,
> and what recommendations do you have?
>
> Thanks,
>
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