Prototyping Innovative Data Storage
Ceph 
is a distributed file system designed for reliability, scalability, and performance. The storage system consists of some (potentially large) number of storage servers (bricks), a smaller set of metadata server daemons, and a few monitor daemons for managing cluster membership and state.
XTREEMFS 
is a distributed and replicated file system for the Internet. Distributed: Clients and servers can be distributed world-wide.
XtreemFS allows you to mount and access your files via the internet from anywhere. Replicated: With
XtreemFS you can easily replicate your files across data-centers to reduce network consumption, latency and increase data availability.