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Distributed File Systems

Distributed File Systems. NFS. NFS Architecture (1). The remote access model. The upload/download model. NFS Architecture (2). The basic NFS architecture for UNIX systems. File System Model. An incomplete list of file system operations supported by NFS. Communication.

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Distributed File Systems

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  1. Distributed File Systems NFS

  2. NFS Architecture (1) • The remote access model. • The upload/download model

  3. NFS Architecture (2) • The basic NFS architecture for UNIX systems.

  4. File System Model • An incomplete list of file system operations supported by NFS.

  5. Communication • Reading data from a file in NFS version 3. • Reading data using a compound procedure in version 4.

  6. Naming (1) • Mounting (part of) a remote file system in NFS.

  7. Naming (2) • Mounting nested directories from multiple servers in NFS.

  8. Automounting (1) • A simple automounter for NFS.

  9. Automounting (2) • Using symbolic links with automounting.

  10. File Attributes (1) • Some general mandatory file attributes in NFS.

  11. File Attributes (2) • Some general recommended file attributes.

  12. Semantics of File Sharing (1) • On a single processor, when a read follows a write, the value returned by the read is the value just written. • In a distributed system with caching, obsolete values may be returned.

  13. Semantics of File Sharing (2) • Four ways of dealing with the shared files in a distributed system.

  14. File Locking in NFS (1) • NFS version 4 operations related to file locking.

  15. File Locking in NFS (2) Requestaccess Currentaccessstate • The result of an open operation with share reservations in NFS. • When the client requests shared access given the current denial state. • When the client requests a denial state given the current file access state.

  16. Client Caching (1) • Client-side caching in NFS.

  17. Client Caching (2) • Using the NFS version 4 callback mechanism to recall file delegation.

  18. RPC Failures • Three situations for handling retransmissions. • The request is still in progress • The reply has just been returned • The reply has been some time ago, but was lost.

  19. Security • The NFS security architecture.

  20. Secure RPCs • Secure RPC in NFS version 4.

  21. Access Control • The classification of operations recognized by NFS with respect to access control.

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