My two cents... The current multi-host mode is really making the assumption that if the NC running in the dom0 is gone, all the VMs are likely screwed anyway.
When you are talking about a middle-ground, you'll need to handle NC failures and load-balance among the NCs. You'll also need to worry about the traffic, because the placement of NCs on a subset of nodes becomes important. What you really need is a scalable NATter array, which kinda load-balance and fail-over across projects. I'm trying to prototype this now with my colleague actually :-) -Simon On Tue, Feb 7, 2012 at 4:27 PM, Nathanael Burton < nathanael.i.bur...@gmail.com> wrote: > 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 >
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