GlusterFS

From the Gluster documentation:

GlusterFS is an open source, distributed file system capable of scaling to several petabytes (actually, 72 brontobytes!) 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.

The GlusterFS is a popular filesystem which can be used with Xen Project.

HOWTOs

• Setting up a GlusterFS filesystem as an iSCSI target (article was recommended by Gluster person)