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I’ve been doing some tests with mongodb and sharding and at some point I tried to add new config servers to my mongos router (at that time, I was playing with just one config server). But I couldn’t find any information on how to do this.
Have anybody tried to do such a thing?
Unfortunately you will need to shutdown the entire system.
Shutdown all processes (mongod, mongos, config server).
Copy the data subdirectories (dbpath tree) from the config server to the new config servers.
Start the config servers.
Restart mongos processes with the new –configdb parameter.
Restart mongod processes.
From: http://www.mongodb.org/display/DOCS/Changing+Config+Servers