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Oh, what you mean is vertical splitting, while I'm talking about horizontal
splitting.

I'm a little confused about why Neutron is designed so differently with
Nova and Cinder. In fact MD could be very simple, delegating nearly all
things out to agent. Remember Cinder volume manager? The real storage
backend could also be deployed outside the server farm as the dedicated
hardware, not necessary the local host based resource. The agent could act
as the proxy to an outside module, instead of heavy burden on central
plugin servers, and also, all backend can inter-operate and co-exist
seamlessly (like a single vxlan across ovs and tor in hybrid deployment)


On Thu, Feb 26, 2015 at 9:39 AM, Kevin Benton <blak111 at gmail.com> wrote:

> In the cases I'm referring to, OVS handles the security groups and
> vswitch.  The other drivers handle fabric configuration for VLAN tagging to
> the host and whatever other plumbing they want to do.
> On Feb 25, 2015 5:30 PM, "loy wolfe" <loywolfe at gmail.com> wrote:
>
>>
>>
>> On Thu, Feb 26, 2015 at 3:51 AM, Kevin Benton <blak111 at gmail.com> wrote:
>>
>>> The fact that a system doesn't use a neutron agent is not a good
>>> justification for monolithic vs driver. The VLAN drivers co-exist with OVS
>>> just fine when using VLAN encapsulation even though some are agent-less.
>>>
>> so how about security group, and all other things which need coordination
>> between vswitchs?
>>
>>
>>>  There is a missing way to coordinate connectivity with tunnel networks
>>> across drivers, but that doesn't mean you can't run multiple drivers to
>>> handle different types or just to provide additional features (auditing,
>>> more access control, etc).
>>> On Feb 25, 2015 2:04 AM, "loy wolfe" <loywolfe at gmail.com> wrote:
>>>
>>>> +1 to separate monolithic OVN plugin
>>>>
>>>> The ML2 has been designed for co-existing of multiple heterogeneous
>>>> backends, it works well for all agent solutions: OVS, Linux Bridge, and
>>>> even ofagent.
>>>>
>>>> However, when things come with all kinds of agentless solutions,
>>>> especially all kinds of SDN controller (except for Ryu-Lib style),
>>>> Mechanism Driver became the new monolithic place despite the benefits of
>>>> code reduction:  MDs can't inter-operate neither between themselves nor
>>>> with ovs/bridge agent L2pop, each MD has its own exclusive vxlan
>>>> mapping/broadcasting solution.
>>>>
>>>> So my suggestion is that keep those "thin" MD(with agent) in ML2
>>>> framework (also inter-operate with native Neutron L3/service plugins),
>>>> while all other "fat" MD(agentless) go with the old style of monolithic
>>>> plugin, with all L2-L7 features tightly integrated.
>>>>
>>>> On Wed, Feb 25, 2015 at 9:25 AM, Amit Kumar Saha (amisaha) <
>>>> amisaha at cisco.com> wrote:
>>>>
>>>>>  Hi,
>>>>>
>>>>>
>>>>>
>>>>> I am new to OpenStack (and am particularly interested in networking).
>>>>> I am getting a bit confused by this discussion. Aren’t there already a few
>>>>> monolithic plugins (that is what I could understand from reading the
>>>>> Networking chapter of the OpenStack Cloud Administrator Guide. Table 7.3
>>>>> Available networking plugi-ins)? So how do we have interoperability between
>>>>> those (or do we not intend to)?
>>>>>
>>>>>
>>>>>
>>>>> BTW, it is funny that the acronym ML can also be used for “monolithic”
>>>>> J
>>>>>
>>>>>
>>>>>
>>>>> Regards,
>>>>>
>>>>> Amit Saha
>>>>>
>>>>> Cisco, Bangalore
>>>>>
>>>>>
>>>>>
>>>>>
>>>>>
>>>>
>>>>
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>>>>
>>>
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