"GlusterFS is a general purpose distributed file system for scalable storage. It aggregates various storage bricks over Infiniband RDMA or TCP/IP interconnect into one large parallel network file system. GlusterFS is based on a stackable user space design without compromising performance. From the ground zero days it has found a variety of applications ranging from Cloud Computing, Biomedical Sciences to Archival Storage." Source: Wikipedia
Dave Hall Consulting has assisted with testing GlusterFS and worked with ubuntu developers to have 3.0 included in ubuntu 10.04LTS. Dave also gave a presentation about GlusterFS at the March 2010 meeting of Linux Users of Victoria.
Project Website: http://gluster.org