GlusterFS is a scalable network filesystem. Using common off-the-shelf hardware, you can create large, distributed storage solutions for media streaming, data analysis, and other data- and bandwidth-intensive tasks. GlusterFS is free and open source software.

Ceph is a distributed object store and file system designed to provide excellent performance, reliability and scalability. - See more at: http://ceph.com/#sthash.r9SlwwGL.dpuf