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I always am annoyed when I read that CouchDB can "scale up and down". CouchDB has NO internal concept of sharding. The only thing it can do is repliaction. Riak and Cassandra can actually scale up and down, CouchDB can scale up and down as much as MySQL can... (or did I miss something?)

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There is a recently open-sourced fork of CouchDB that does the sharding thing. With this addition to the capabilities, CouchDB really can scale up to hundred machine clusters.

http://blog.cloudant.com/cloudant-core-is-open-source

update just found a great article on scaling with CouchDB using Lounge http://nosql.mypopescu.com/post/683838234/scaling-couchdb

and a company that provides the service Cloudant: https://cloudant.com/

Here's another shard manager project, Pillow: http://knuthellan.com/2010/07/14/feature-prioritization-for-...

I think the design philosophy for couch is keeping smaller pieces of Big Data synchronized. The sum of all those small pieces is like one larger database.

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