With the default networking there's a single nova-network service. With the --multi_host option, 'set_network_host' sets every instance to use their host as the nova-network node, effectively requiring nova-network to run on every nova-compute. The multi_host mode greatly helps HA and consolidates fault domains, but at the cost of increased complexity and IP sprawl when using the VLAN networking model, as each host in the zone now has to have an IP on every VLAN.
What I think I'm looking for is a middle ground where you can run multiple nova-network nodes, but not equal to the number of compute nodes. Basically a similar ability as implemented with the nova-volume service; the ability to scale the nova-network nodes independently from the computes. The big downside is that you no longer have the benefit of combined fault domains (network/compute). Is any of this possible today? Does Quantum with OpenvSwitch handle any of this either? Thoughts? Thanks, Nate _______________________________________________ Mailing list: https://launchpad.net/~openstack Post to : openstack@lists.launchpad.net Unsubscribe : https://launchpad.net/~openstack More help : https://help.launchpad.net/ListHelp
