Chapter 11 DISTRIBUTED FILE SYSTEMS
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1 DISTRIBUTED SYSTEMS Principles and Paradigms Second Edition ANDREW S. TANENBAUM MAARTEN VAN STEEN Chapter 11 DISTRIBUTED FILE SYSTEMS
2 Client-Server Architectures (1) Figure (a) The remote access model. (b) The upload/download model.
3 Client-Server Architectures (2) Figure The basic NFS architecture for UNIX systems.
4 File System Model (1) Figure An incomplete list of file system operations supported by NFS.
5 File System Model (2) Figure An incomplete list of file system operations supported by NFS.
6 Cluster-Based Distributed File Systems (1) Figure The difference between (a) distributing whole files across several servers and (b) striping files for parallel access.
7 Cluster-Based Distributed File Systems (2) Figure The organization of a Google cluster of servers.
8 Symmetric Architectures Figure The organization of the Ivy distributed file system.
9 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.
10 The RPC2 Subsystem (1) Figure Side effects in Coda s RPC2 system.
11 The RPC2 Subsystem (2) Figure (a) Sending an invalidation message one at a time. (b) Sending invalidation messages in parallel.
12 File-Oriented Communication in Plan 9 Figure Files associated with a single TCP connection in Plan 9.
13 Naming in NFS (1) Figure Mounting (part of) a remote file system in NFS.
14 Naming in NFS (2) Figure Mounting nested directories from multiple servers in NFS.
15 Automounting (1) Figure A simple automounter for NFS.
16 Automounting (2) Figure Using symbolic links with automounting.
17 Constructing a Global Name Space Figure Junctions in GNS.
18 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.
19 Semantics of File Sharing (2) Figure (b) In a distributed system with caching, obsolete values may be returned.
20 Semantics of File Sharing (3) Figure Four ways of dealing with the shared files in a distributed system.
21 File Locking (1) Figure NFSv4 operations related to file locking.
22 File Locking (2) Figure The result of an open operation with share reservations in NFS. (a) When the client requests shared access given the current denial state.
23 File Locking (3) Figure The result of an open operation with share reservations in NFS. (b) When the client requests a denial state given the current file access state.
24 Sharing Files in Coda Figure The transactional behavior in sharing files in Coda.
25 Client-Side Caching (1) Figure Client-side caching in NFS.
26 Client-Side Caching (2) Figure Using the NFSv4 callback mechanism to recall file delegation.
27 Client-Side Caching in Coda Figure The use of local copies when opening a session in Coda.
28 Server Replication in Coda Figure Two clients with a different AVSG for the same replicated file.
29 Structured Peer-to-Peer Systems Figure Balancing load in a peer-to-peer system by replication.
30 Handling Byzantine Failures Figure The different phases in Byzantine fault tolerance.
31 High Availability in Peer-to-Peer Systems Figure The ratio r rep /r ec as a function of node availability a.
32 Security in NFS Figure The NFS security architecture.
33 Secure RPCs Figure Secure RPC in NFSv4.
34 Access Control Figure The various kinds of users and processes distinguished by NFS with respect to access control.
35 Decentralized Authentication (1) Figure The organization of SFS.
36 Decentralized Authentication (2) Figure A self-certifying pathname in SFS.
37 Secure Lookups in DHT-Based Systems Secure routing requires that three issues are dealt with: 1. Nodes are assigned identifiers in a secure way. 2. Routing tables are securely maintained. 3. Lookup requests are securely forwarded between nodes.
38 Secure Collaborative Storage Figure The principle of storage claims in the Samsara peer-to-peer system.
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