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This Concept Map, created with IHMC CmapTools, has information related to: ch8 dist enha, Recent advances has AFS enhancements: DCE/DFS was based on AFS, but goes beyond in its approach to cache consistency, Recent advances has new design approaches: availability of high performance networks, ATM, have paved the way to provide persistant storge systems XFS- a serverless network file system architecture motivated by: 1 opportunity provided by fast switched LANs for multiple file servers in a local network to transfer bulk data to clients concurrently 2 increased demand for access to shared data 3 the fundamental limitations of systems based on central file servers frangipani: is a highly scalable distributed file system developed with a design that separates persistent storage responsibilites from other file service actions, Recent advances has Improvements in storage organization: redundant arrays of inexpensive disks(RAID)- data blocks are segmented into fixed size chunks and stored in stripes across several disks, along with redundant error correcting codes that enable the data blocks to be reconstructed completely and operation to continue normally in case of disk failures log structured file storage(LFS)- like spritely NFS, this technique originated in the sprite distributed OS project at Berkeley, Recent advances has NFS enhancements: updated one copy update semantics by extending the NFS protol to include open and close operations and adding a callback mechanism to enable the server to notify clients of the need to invalidate cache entries, achieving one copy update semantics- the stateless server architecture of NFS brought great advantages in robustness and ease of implementation for NFS, but it precluded the achievement of precise one copy update semantics NQNFS- had a similar aims to spritely NFS- to add more precise cache consistency to the NFS protocol and to improve performance through better use of caching WebNFS- the advent of the web and java applets led to the recognition by the NFS development team and others that some internet apps could benefit from direct access to NFS servers without many of the overheads associated with the emulation of UNIX file operations included in standard NFS clients NFS version 4- aims to make practical to use NFS in wide area networks and internet apps