This is dynomite. It is a clone of the amazon dynamo key value store written in Erlang.
http://www.allthingsdistributed.com/2007/10/amazons_dynamo.html
To use:
git clone git://github.com/cliffmoon/dynomite.git
cd dynomite
git submodule init
git submodule update
rake
./bin/dynomite start -m ~/some/data/dir -n 1 -r 1 -w 1