Yes, that's true, and that's what we're doing really. Our order of
upgrade is q-srv -> q-ovs-agent -> q-dhcp and rest. If that causes
issues, please submit bug for it. We should address that in our
playbooks.

On 8 August 2016 at 17:02, Ihar Hrachyshka <ihrac...@redhat.com> wrote:
> (Adding back ops@)
>
> Michał Jastrzębski <inc...@gmail.com> wrote:
>
>> Yes, but it's a bit different. Difference being if you're doing it
>> right, you can keep nova running during upgrade. Can't say the same
>> for neutron.
>
>
> There is ongoing work to make it possible. The way it looks now, it will
> take Ocata the least. Till that happy time, you should indeed all
> controllers before upgrading database.
>
> That said, you can still run your agents while you upgrade your controller
> nodes. Once you are done with controllers, you can upgrade one remaining
> node running agents at a time.
>
> Ihar

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