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Kapitel8[1]
Kapitel8[1]

... distributed applications • Communication oriented design: FIRST design the communication protocol for the distributed system and then the program is developed accordingly • Application oriented design: Develop the application as if everything were locally and then divide the application in modules w ...
Section 17 - Dist. File Sys
Section 17 - Dist. File Sys

... locality of reference in file accesses. Servers can be accessed only occasionally rather than for each access. 2. Caching causes data to be moved in a few big chunks rather than in many smaller pieces; this leads to considerable efficiency for the network. 3. Disk accesses can be better optimized on ...
Distributed File Systems
Distributed File Systems

1

Distributed Data Management Architecture

Distributed Data Management Architecture (DDM) is IBM's open, published software architecture for creating, managing and accessing data on a remote computer. DDM was initially designed to support record-oriented files; it was extended to support hierarchical directories, stream-oriented files, queues, and system command processing; it was further extended to be the base of IBM's Distributed Relational Database Architecture (DRDA); and finally, it was extended to support data description and conversion. Defined in the period from 1980 to 1993, DDM specifies necessary components, messages, and protocols, all based on the principles of object-orientation. DDM is not, in itself, a piece of software; the implementation of DDM takes the form of client and server products. As an open architecture, products can implement subsets of DDM architecture and products can extend DDM to meet additional requirements. Taken together, DDM products implement a distributed file system.
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