GlusterFS is a flexible, powerful, POSIX-compliant cluster filesystem
that can scale to several petabytes.

GlusterFS works over either TCP/IP or high-performance Infiniband RDMA
interconnect.

GlusterFS provides striping and on-the-fly synchronous replication
of files. GlusterFS has a fully distributed design, with no
single point of failure.

Please visit http://www.gluster.org/glusterfs.php for more info.