GlusterFS is an open source, distributed file system capable of
scaling to several petabytes and handling thousands of
clients. GlusterFS clusters together storage building blocks over
Infiniband RDMA or TCP/IP interconnect, aggregating disk and memory
resources and managing data in a single global namespace.  GlusterFS
is based on a stackable user space design and can deliver exceptional
performance for diverse workloads.

WWW: http://www.gluster.org