[ndemoor]

Although I am a heavy user/believer of MongoDB, one caveat that is overlooked in this article is the administration part of Mongo Clusters.

Even the simplest replication needs 3 servers, add sharding to the dance for extra performance and the server counter jumps up. For startups this is a major decision to consider as a full-time ops guy isn't always affordable. Luckily, PaaS services as MongoLabs and MongoHQ save the day.

[taligent]

I don't understand your point.

You could use replication (master/slave) with 2 servers and you don't have to use sharding for anything. How is MongoDB not the same as every other database ?

If anything MongoDB is by far the easiest database I've ever used for setting up clustering/sharding.

[ndemoor]

To have a legitimate replication setup, an arbiter node is highly recommended: http://docs.mongodb.org/manual/administration/replication-ar...

[ukd1]

Master / slave is deprecated. Replica sets can run on 2 nodes however, running on an even number of nodes in a set is a very bad idea as a primary node failure will cause the rest of your nodes to go read-only. Always run an odd number. Avoid master / slave.

[sauravc]

Have you tried CouchBase? The built in admin panel is a dream. Adding and removing servers to a cluster is super easy.

http://www.couchbase.com/docs/couchbase-manual-2.0/couchbase...