I'd like to encourage everybody interested to take a look and leave
comments on the Neutron migration spec here:

The design currently includes both "cold" and "live" approaches, supports
host-by-host migration (as opposite to big bang)
and doesn't require to freeze the whole deployment during upgrade.

I've also started prototyping the above spec:
https://review.openstack.org/#/c/111755 - Neutron migration: synchronize IP
(de)allocations with Nova-net
https://review.openstack.org/#/c/115635 - Neutron migration as part of cold

On Tue, Aug 26, 2014 at 1:59 PM, Tim Bell <tim.b...@cern.ch> wrote:

> > From: Michael Still [mailto:mi...@stillhq.com]
> > Sent: 25 August 2014 23:38
> > To: OpenStack Development Mailing List (not for usage questions)
> > Subject: Re: [openstack-dev] [nova][neutron] Migration from nova-network
> to Neutron for large production clouds
> ...
> > Mark McClain and I discussed a possible plan for nova-network to neutron
> upgrades at the Ops Meetup today, and it seemed generally acceptable. It
> defines a "cold migration" as
> > freezing the ability to create or destroy instances during the upgrade,
> and then requiring a short network outage for each instance in the cell.
> > This is why I'm trying to understand the "no downtime" use case better.
> Is it literally no downtime, ever? Or is it a more simple "no simultaneous
> downtime for instances"?
> > Michael
> The simultaneous downtime across the cloud is the one we really need to
> avoid. Short network outages (depending on how you define short) can be
> handled along with blocking API operations for short periods.
> The other item was how to stage the upgrade.. with a cloud of a
> significant size and some concerns about scalability, we would like to be
> able to do the migration as a set of steps rather than a big bang. During
> the gap between the steps, we'd like to open the APIs for usage, such as
> new VMs get created on Neutron hypervisors. Would that be a possibility ?
> Tim
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