Hi everyone, A colleague and I have more or less recently been tasked with redesigning my employers openstack-infrastructure and it turned out that starting over will be easier than fixing the existing stack as we've managed to lock ourselves in a corner quite good. The requirements we've got are basically "here's 50 compute-nodes, make sure whatever you're building scales upwards from there". We have the existing pike-stack as a reference but we don't really know how the different services scale up with more compute-nodes to handle. The pike-stack has three servers as control-plane, each of them with 96G of RAM and they don't seem to have too much room left when coordinating 14 compute-nodes. We're thinking about splitting the control-nodes into infrastructure (db/rabbit/memcache) and API. What would I want to look for when sizing those control-nodes? I've not been able to find any references for this at all, just rather nebulous '8G RAM should do' which is around what our rabbit currently inhales. Also: We're currently running Neutron in OVS-DVR-VXLAN-Configuration. Does that properly scale up and above 50+ nodes or should we look into offloading the networking onto something else? I'm aware that the questions may sound a bit funny, but we have to spec out the controlplane-hardware before we can start testing and we'd prefer not to retrofit the servers because we goofed up. Thanks for your time, -- Cheers, Hardy