typically not in heterogeneous environments. NAS servers support locking mechanisms for multiple NFS protocols, allowing file systems to be safely shared in heterogeneous environments. One of the biggest advantages of NAS over file servers is scalability. An enterprise NAS array has multiple internal
device buses to
accommodate many disks with high performance and high availability. NAS has its scalability issues—it’s generally not as scalable as SAN storage—but it is a lot more scalable than adding external RAID arrays to a file server.