Jeff Layton an Enterprise Technologist for HPC at Dell discusses reasons why he thinks GlusterFS is one of the coolest file systems in User Space.
[GlusterFS] has a very unique architecture that allows it to be configured for specific storage requirements and scenarios. It can be used as a high-performance parallel file system, or a cloud based file system, or even a simple NFS server. All of this in user-space. Could GlusterFS represent the future of file system development for Linux?