CODEWITHSUNDEEP
mongodbdistributeddatabasenosql
BufBills
BufBills

Reputation: 8103

mongodb shards, how many mongod for this case

In mongodb. If you want to build a production system with two shards, each one a replica set with three nodes, how may mongod processes must you start?

why the answer is 9?

Upvotes: 1

Views: 1068

Answers (1)

smolinari
smolinari

Reputation: 701

Because you need 3 replicas per shard x the 2 shards + 3 config servers to run the sharded cluster = 9 mongods. The config servers, although also mongod processes, aren't data carrying nodes. You must have 3 config servers though, to guarantee redundancy among the config server nodes.

http://docs.mongodb.org/manual/core/sharded-cluster-architectures-production/

Upvotes: 1

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