on  NetWare . Network File System  (NFS) originally from  Sun Microsystems  is the standard in UNIX-based networks. NFS may use  Kerberos  authentication and a client  cache . (4.1 only) OS4000  Linked-OS provides distributed filesystem across OS4000 systems. Secure File System  (SFS)  [2] Self-certifying File System  (SFS), a global network file system