Elliptics network is a fault tolerant key/value storage.
It was designed to handle all error cases starting from simple disk problems upto datacenter failures.
With default key generation policy it implements distributed hash table object storage.
The network does not use dedicated servers to maintain the metadata information,
it supports redundant objects storage.
Small to medium sized write benchmarks can be found on eblob page and in the appropriate blog section.
For more details check http://reverbrain.com/elliptics
Google group: https://groups.google.com/forum/?fromgroups=#!forum/reverbrain