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On 10/30/2015 4:29 AM, Andreas Jaeger wrote:
> Maybe interesting for some of you as well,
>
> Andreas
>
>
> -------- Forwarded Message --------
> Subject: [cloud-devel] Summit Report - Dirk
> Date: Fri, 30 Oct 2015 17:46:06 +0900
> From: Dirk Müller <dmueller at suse.com>
[...]
> There were a couple of good design sessions. In general my impression it
> is that the decision less crazy than it was before, which is a good
> thing. Particularly worth mentioning was the session about Live Upgrade
> which was eye-opening to me. it looks like we’ll have plenty of fun to
> do that when we’re skipping a release since nova’s implementation is
> depending on customer to upgrade from N to N+1 to N+2. skipping a
> release is unsupported. Tom and I discussed probably a few hours about
> that during the summit already. 
[...]

This is due to online data migrations which are a key part of live 
upgrade. Dan Smith has an excellent series of blog posts on that 
starting here [1].

[1] http://www.danplanet.com/blog/2015/10/05/upgrades-in-nova-the-details/

-- 

Thanks,

Matt Riedemann