> On 06/07/10 14:12, Peter McGowan wrote: >> Hi >> >> I'm looking to put together a two-node cluster that will use HP iLOs for >> fencing. The systems have their bond0 interfaces connected to the public >> LAN, and I was intending to use a private non-routable network (bond1) >> purely for cluster communication traffic. >> >> What's confused me is the line in the CMAN FAQ which says "If you are >> using per-node power management of any sort where the device is not >> shared between cluster nodes, it must be connected to the same network >> used by CMAN for cluster communication" >> >> Is anyone able to define "same network" in this context? My iLOs will be >> reachable through bond0 (public LAN), but not through bond1 (cluster >> network) - does this count as "same network"? >> > > > No it doesn't. "Same network" means the same (set of) interfaces that the > cluster traffic goes over. > > The reason for this is so that in the event of a network outage, only one > node has access to the fence device and can fence the other. If the fence > device is on a different network (as yours is) then both nodes will be able > to fence each other in the event that the cluster communications network > breaks. When this happens both nodes will be rebooted, rather than just one. > > Chrissie
OK, that makes sense, thanks for the answer. It sounds like using a separate network for cluster communication is generally not such a good idea, as I wouldn't be able to use ping type heuristics either if I decide to use a quorum disk. Thanks, Peter
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