I have a geographically dispersed ("stretch") cluster, where one node is
in data center A and the other node is in data center B. I have done
everything possible to ensure link redundancy between the cluster nodes.
Each node has 4 x gigabit links connected to 4 different sets of
switches and routers that connect the two data centers. The data centers
are connected over two dual counter-rotating SONET rings.
That said, the possibility remains that the links between the two data
centers could be severed, leading to cluster partition. Is there a way
to provide another quorum vote or something equivalent from a third
location out on the Internet without having a full cluster node out
there? Florian mentioned earlier that a full cluster node would probably
not work well because of the bandwidth and latencies involved. What I
really want is some kind of lightweight arbiter or quorum daemon at the
third location. I've looked around but have not seen anything like that.
Does anyone have any ideas? I've thought of trying to roll my own using
ssh and shell scripts.
--
Eric Robinson
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