GlusterFS is a powerful network/cluster filesystem. Posix compliant. You can keep scaling your storage beyond peta bytes as your demand increases. GlusterFS natively supports Infiniband verbs calls to do RDMA between remote machine to get the maximum I/O throughput. It has on the fly replication and striping as inbuilt options. Please visit http://www.gluster.org/glusterfs.php for more info.