Tanenbaum & Van Steen, Distributed Systems: Principles and Paradigms, 2e, (c) 2007 Prentice-Hall, Inc. All rights reserved. 0-13-239227-5 DISTRIBUTED SYSTEMS.

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Tanenbaum & Van Steen, Distributed Systems: Principles and Paradigms, 2e, (c) 2007 Prentice-Hall, Inc. All rights reserved DISTRIBUTED SYSTEMS Principles and Paradigms Second Edition ANDREW S. TANENBAUM MAARTEN VAN STEEN Chapter 11 DISTRIBUTED FILE SYSTEMS

Tanenbaum & Van Steen, Distributed Systems: Principles and Paradigms, 2e, (c) 2007 Prentice-Hall, Inc. All rights reserved Client-Server Architectures (1) Figure (a) The remote access model. (b) The upload/download model.

Tanenbaum & Van Steen, Distributed Systems: Principles and Paradigms, 2e, (c) 2007 Prentice-Hall, Inc. All rights reserved Client-Server Architectures (2) Figure The basic NFS architecture for UNIX systems.

Tanenbaum & Van Steen, Distributed Systems: Principles and Paradigms, 2e, (c) 2007 Prentice-Hall, Inc. All rights reserved File System Model (1) Figure An incomplete list of file system operations supported by NFS.

Tanenbaum & Van Steen, Distributed Systems: Principles and Paradigms, 2e, (c) 2007 Prentice-Hall, Inc. All rights reserved File System Model (2) Figure An incomplete list of file system operations supported by NFS.

Tanenbaum & Van Steen, Distributed Systems: Principles and Paradigms, 2e, (c) 2007 Prentice-Hall, Inc. All rights reserved Cluster-Based Distributed File Systems (1) Figure The difference between (a) distributing whole files across several servers and (b) striping files for parallel access.

Tanenbaum & Van Steen, Distributed Systems: Principles and Paradigms, 2e, (c) 2007 Prentice-Hall, Inc. All rights reserved Cluster-Based Distributed File Systems (2) Figure The organization of a Google cluster of servers.

Tanenbaum & Van Steen, Distributed Systems: Principles and Paradigms, 2e, (c) 2007 Prentice-Hall, Inc. All rights reserved Symmetric Architectures Figure The organization of the Ivy distributed file system.

Tanenbaum & Van Steen, Distributed Systems: Principles and Paradigms, 2e, (c) 2007 Prentice-Hall, Inc. All rights reserved Remote Procedure Calls in NFS Figure (a) Reading data from a file in NFS version 3. (b) Reading data using a compound procedure in version 4.

Tanenbaum & Van Steen, Distributed Systems: Principles and Paradigms, 2e, (c) 2007 Prentice-Hall, Inc. All rights reserved The RPC2 Subsystem (1) Figure Side effects in Coda’s RPC2 system.

Tanenbaum & Van Steen, Distributed Systems: Principles and Paradigms, 2e, (c) 2007 Prentice-Hall, Inc. All rights reserved The RPC2 Subsystem (2) Figure (a) Sending an invalidation message one at a time. (b) Sending invalidation messages in parallel.

Tanenbaum & Van Steen, Distributed Systems: Principles and Paradigms, 2e, (c) 2007 Prentice-Hall, Inc. All rights reserved File-Oriented Communication in Plan 9 Figure Files associated with a single TCP connection in Plan 9.

Tanenbaum & Van Steen, Distributed Systems: Principles and Paradigms, 2e, (c) 2007 Prentice-Hall, Inc. All rights reserved Naming in NFS (1) Figure Mounting (part of) a remote file system in NFS.

Tanenbaum & Van Steen, Distributed Systems: Principles and Paradigms, 2e, (c) 2007 Prentice-Hall, Inc. All rights reserved Naming in NFS (2) Figure Mounting nested directories from multiple servers in NFS.

Tanenbaum & Van Steen, Distributed Systems: Principles and Paradigms, 2e, (c) 2007 Prentice-Hall, Inc. All rights reserved Automounting (1) Figure A simple automounter for NFS.

Tanenbaum & Van Steen, Distributed Systems: Principles and Paradigms, 2e, (c) 2007 Prentice-Hall, Inc. All rights reserved Semantics of File Sharing (1) Figure (a) On a single processor, when a read follows a write, the value returned by the read is the value just written.

Tanenbaum & Van Steen, Distributed Systems: Principles and Paradigms, 2e, (c) 2007 Prentice-Hall, Inc. All rights reserved Semantics of File Sharing (2) Figure (b) In a distributed system with caching, obsolete values may be returned.

Tanenbaum & Van Steen, Distributed Systems: Principles and Paradigms, 2e, (c) 2007 Prentice-Hall, Inc. All rights reserved Semantics of File Sharing (3) Figure Four ways of dealing with the shared files in a distributed system.

Tanenbaum & Van Steen, Distributed Systems: Principles and Paradigms, 2e, (c) 2007 Prentice-Hall, Inc. All rights reserved File Locking (1) Figure NFSv4 operations related to file locking.

Tanenbaum & Van Steen, Distributed Systems: Principles and Paradigms, 2e, (c) 2007 Prentice-Hall, Inc. All rights reserved Sharing Files in Coda Figure The transactional behavior in sharing files in Coda.

Tanenbaum & Van Steen, Distributed Systems: Principles and Paradigms, 2e, (c) 2007 Prentice-Hall, Inc. All rights reserved Client-Side Caching (1) Figure Client-side caching in NFS.

Tanenbaum & Van Steen, Distributed Systems: Principles and Paradigms, 2e, (c) 2007 Prentice-Hall, Inc. All rights reserved Client-Side Caching (2) Figure Using the NFSv4 callback mechanism to recall file delegation.

Tanenbaum & Van Steen, Distributed Systems: Principles and Paradigms, 2e, (c) 2007 Prentice-Hall, Inc. All rights reserved Client-Side Caching in Coda Figure The use of local copies when opening a session in Coda.

Tanenbaum & Van Steen, Distributed Systems: Principles and Paradigms, 2e, (c) 2007 Prentice-Hall, Inc. All rights reserved Server Replication in Coda Figure Two clients with a different AVSG for the same replicated file.

Tanenbaum & Van Steen, Distributed Systems: Principles and Paradigms, 2e, (c) 2007 Prentice-Hall, Inc. All rights reserved Handling Byzantine Failures Figure The different phases in Byzantine fault tolerance.

Tanenbaum & Van Steen, Distributed Systems: Principles and Paradigms, 2e, (c) 2007 Prentice-Hall, Inc. All rights reserved Security in NFS Figure The NFS security architecture.

Tanenbaum & Van Steen, Distributed Systems: Principles and Paradigms, 2e, (c) 2007 Prentice-Hall, Inc. All rights reserved Secure RPCs Figure Secure RPC in NFSv4.

Tanenbaum & Van Steen, Distributed Systems: Principles and Paradigms, 2e, (c) 2007 Prentice-Hall, Inc. All rights reserved Access Control Figure The various kinds of users and processes distinguished by NFS with respect to access control.

Tanenbaum & Van Steen, Distributed Systems: Principles and Paradigms, 2e, (c) 2007 Prentice-Hall, Inc. All rights reserved Decentralized Authentication (1) Figure The organization of SFS.

Tanenbaum & Van Steen, Distributed Systems: Principles and Paradigms, 2e, (c) 2007 Prentice-Hall, Inc. All rights reserved Decentralized Authentication (2) Figure A self-certifying pathname in SFS.

Tanenbaum & Van Steen, Distributed Systems: Principles and Paradigms, 2e, (c) 2007 Prentice-Hall, Inc. All rights reserved Secure Collaborative Storage Figure The principle of storage claims in the Samsara peer-to-peer system.