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Hi Danny,

thanks for sharing your positive experience. I'm going to deploy OVN in dev
environment with kolla-ansible. Maybe one more question. Is there any
official way to migrate from OVS to OVN with kolla-ansible, or have you
used the official migration script
https://docs.openstack.org/networking-ovn/latest/install/migration.html?



On Thu, Mar 16, 2023 at 5:43 PM Danny Webb <Danny.Webb at thehutgroup.com>
wrote:

> Hi Kamil,
>
> We're currently running 4 (soon to be 5) production regions all using
> kolla ansible as our deployer with OVN as our neutron backend.  It's been
> fairly solid for us and we've  had less issues with OVN than the
> traditional hybrid OVS / Iptables neutron driver (which we ran for about a
> year before switching to OVN).  Our regions are anywhere from 50-60 compute
> hosts with 1-2k+ VMs per region.  As far as I know most of the new
> development is going into OVN so would be a good place to start.
> Ultimately, we've only really had 2 real issues whilst running it.  First
> was an issue where we had the provider network spamming gateway changes
> into southbound as we had our anycast SVI bound to our top of rack switches
> which made OVN keep updating it's location.  We mitigated this by moving
> the provider SVIs to our border routers and the issue went away and dropped
> the load on our OVN controllers significantly.   Only other real issue we
> had was during an upgrade of a region we ended up with what we believed to
> be some sort of stale flows that resulted in some hypervisors losing
> connectivity until we rebooted them.
>
> Hope this helps!
>
> Cheers,
>
> Danny
> ------------------------------
> *From:* Kamil Madac <kamil.madac at gmail.com>
> *Sent:* 14 March 2023 09:46
> *To:* openstack-discuss <openstack-discuss at lists.openstack.org>
> *Subject:* [neutron]
>
>
> * CAUTION: This email originates from outside THG *
> ------------------------------
> Hi All,
>
> I'm in the process of planning a small public cloud based on OpenStack. I
> have quite experience with kolla-ansible deployments which use OVS
> networking and I have no issues with that. It works stable for my use cases
> (Vlan provider networks, DVR, tenant networks, floating IPs).
>
> For that new deployment I'm looking at OVN deployment which from what I
> read should be more performant (faster build of instances) and with ability
> to cover more networking features in OVN instead of needing external
> software like iptables/dnsmasq.
>
> Does anyone use OVN in production and what is your experience (pros/cons)?
> Is OVN mature enough to replace OVS in the production deployment (are
> there some basic features from OVS missing)?
>
> Thanks in advance for sharing the experience.
>
> --
> Kamil Madac <https://kmadac.github.io/>
>
> *Danny Webb*
> Principal OpenStack Engineer
> Danny.Webb at thehutgroup.com
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-- 
Kamil Madac <https://kmadac.github.io/>
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