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Distributed File Systems

vicki avatar
vicki
47 diapositives · 625 Views · Aug 22, 2014

Explore the architecture of NFS, covering file system models, communication methods, naming conventions, file attributes, file sharing semantics, client caching, RPC failures, security aspects, and comparisons with Coda, Plan 9, and xFS.

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Distributed File Systems
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Transcription de la présentation

  1. Distributed File Systems Chapter 10

  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.

  22. The Coda File System • The various kinds of users and processes distinguished by NFS with respect to access control.

  23. Overview of Coda (1) • The overall organization of AFS.

  24. Overview of Coda (2) • The internal organization of a Virtue workstation.

  25. Communication (1) • Side effects in Coda's RPC2 system.

  26. Communication (2) • Sending an invalidation message one at a time. • Sending invalidation messages in parallel.

  27. Naming • Clients in Coda have access to a single shared name space.

  28. File Identifiers • The implementation and resolution of a Coda file identifier.

  29. Sharing Files in Coda • The transactional behavior in sharing files in Coda.

  30. Transactional Semantics • The metadata read and modified for a store session type in Coda.

  31. Client Caching • The use of local copies when opening a session in Coda.

  32. Server Replication • Two clients with different AVSG for the same replicated file.

  33. Disconnected Operation • The state-transition diagram of a Coda client with respect to a volume.

  34. Secure Channels (1) • Mutual authentication in RPC2.

  35. Secure Channels (2) • Setting up a secure channel between a (Venus) client and a Vice server in Coda.

  36. Access Control • Classification of file and directory operations recognized by Coda with respect to access control.

  37. Plan 9: Resources Unified to Files • General organization of Plan 9

  38. Communication • Files associated with a single TCP connection in Plan 9.

  39. Processes • The Plan 9 file server.

  40. Naming • A union directory in Plan 9.

  41. Overview of xFS. • A typical distribution of xFS processes across multiple machines.

  42. Processes (1) • The principle of log-based striping in xFS.

  43. Processes (2) • Reading a block of data in xFS.

  44. Naming • Main data structures used in xFS.

  45. Overview of SFS • The organization of SFS.

  46. Naming • A self-certifying pathname in SFS.

  47. Summary • A comparison between NFS, Coda, Plan 9, xFS. N/S indicates that nothing has been specified.