Kumofs

kumofs is a scalable and highly available distributed key-value store.
Data is replicated over multiple servers.
Data is partitioned over multiple servers.
Extreme single node performance; comparable with memcached.
Both read and write performance got improved as servers added.
Servers can be added without stopping the system.
Servers can be added without changing the client applications.
The system does not stop even if one or two servers crashed.
The system does not stop to recover crashed servers.
Scalable from 2 to 60 servers. (more than 60 servers has not be tested yet)
Optimized for storing a large amount of small data.
memcached protocol support. (get, set and delete only; expiration time and flags must be 0)