Suppose I have three shards and each shard is a replica set consisting of
three *mongod* instances. Suppose furthermore that I run each instance on
its own machine - so I have a total of *six servers*:
I know I need to have at least *three* *config servers* but it is not clear
to me where they should run. Should I run the three config servers on the
three servers I am using for Shard 1? Or split them across the two shards
(run one or two of them on Shard 1 servers and run one or two of them on
Shard 2 servers)? Or should I have another dedicated set of machines just
for the config servers?
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