A clustered NAS system is a distributed file system that runs concurrently on multiple NAS nodes.
The FreeNAS storage operating system is compatible with most major protocols and storage hardware and provides file sharing in a NAS environment.
GlusterFS (Gluster File System) is an open source distributed file system that can scale out in building-block fashion to store multiple petabytes of data.
The Parallel Network File System (pNFS) is part of the NFS v4.1 protocol that allows compute clients to access storage devices directly and in parallel.
Qumulo is a Seattle-based storage vendor that specializes in selling its data-aware storage software application called the Qumulo Core. This product provides detailed data analytics, and these analytics are meant to help customers better manage their data storage.
ZFS is a local file system and logical volume manager created by Sun Microsystems to control the placement, storage and retrieval of data in enterprise computing systems.