Open Stack

Kumar,

How large of a deployment are you considering it for? We've run Neutron in
a fairly large environment (10k+ nodes) for a year now and have learned
some interesting lessons. We use a modified Openvswitch plugin and as such
have no experience with the Nicira plugin. I think the largest single
problem that we have as it pertains to scalability are the race conditions
in neutron-server. Allocating IPs, network, ports etc tend to have some
racey behaviors. I feel like many of these issues are being addressed by
neutron developers, but also Neutron is very viable for large-scale
production today. For instance most of the race conditions that I mention
can be averted if you aren't writing to the database concurrently. You
could designate ONE neutron-server as the "write" server and the rest as
"read", it's a little tricky to do because you have to have a router in
front of them all or reroute requests, but the API set is not very large so
a very doable task. That being said, in our environment we use a single
neutron-server with another standing by as backup. It's not as performant
as we'd like it to be, but it hasn't stopped us from growing so far.

-Mike Wilson

P.S. There is a presentation from the Portland summit that myself and Jun
Park did. In it we talk about some of the issues around scale although
neutron (quantum at the time) is a smaller part of the talk. :
http://www.openstack.org/summit/portland-2013/session-videos/presentation/using-openstack-in-a-traditional-hosting-environment
.


On Wed, Oct 2, 2013 at 11:04 AM, Kumar <chvsnrk at gmail.com> wrote:

> Hi,
>   We are considering to run openstack Neutron in a large scale deployment.
> I would like to know community experience and suggestions.
>
> To get to know the quality I am going through neutron bugs( I assume that
> is the best way to know the quality)
> Some of them are real concerning like below bugs
> https://bugs.launchpad.net/neutron/+bug/1211915
> https://bugs.launchpad.net/neutron/+bug/1230407
> https://bugs.launchpad.net/neutron/+bug/1200001
>
> The bug 1211915 is raised for simple tempest tests,whats about huge
> deployments?
> I am told even vendor neutron plugins too have similar issues when we
> create tens of instances in single click on horizon. And people see too
> many connection timeouts in quantum service logs with vendor plugins as
> well.
>
> I was told that some were struck with nova-network as  there is no support
> yet to migrate  Neutron and they could not take advantage of new network
> services.
>
> I would like to know community thinking on the same. Please note that I am
> not concerned on fix availability.
>
> Thanks,
> -Kumar
>
>
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>
>
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