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.