By Peter Alan Lee, Thomas Anderson (auth.)

ISBN-10: 370918990X

ISBN-13: 9783709189900

ISBN-10: 3709189926

ISBN-13: 9783709189924

The construction of a brand new model of any booklet is a frightening job, as many authors will realize. within the box of computing device technology, the duty is made much more daunting by means of the rate with which the topic and its assisting expertise flow ahead. because the ebook of the 1st variation of this ebook in 1981 a lot examine has been carried out, and lots of papers were written, almost about fault tolerance. Our target then was once to offer for the 1st time the foundations of fault tolerance including present perform to demonstrate these ideas. We think that the rules have (so some distance) stood the try out of time and are as applicable this day as they have been in 1981. a lot paintings at the sensible functions of fault tolerance has been undertaken, and methods were constructed for ever extra advanced events, similar to these required for allotted platforms. however, the elemental rules stay the same.

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G. g. locking of shared objects). As will be seen, the flow of information (particularly erroneous information) is an important consideration SYSTEM STRUCTURE 27 for fault tolerance, and these issues are discussed in more detail in Chapter 6. 14 particularly in the area of data base systems. The widely employed notion of a transaction l5 ,16 enables the user of a data base system to arrange that a sequence of interactions with the data base will constitute an atomic action. e. an action either completes, or has no effect on the system), and permanence of effect which guarantees that the state created by an atomic action is retained even if the computer system crashes.

Within this new level, the structuring model of this chapter can be reapplied. 4 Simple Interpreter Diagram When C is a computing system, S can be identified with the memory containing the program (and data) controlling the system, and H will then comprise the rest of the hardware. The interpretive interface is characterized by a language providing objects and operations to manipulate those objects; this is the machine language of the hardware computer. ) Machine language programs stored in S are executed by fetching, decoding and obeying the individual instructions which make up the programs.

An airline reservation system could fail by booking passengers on a non-existent flight from London to Newcastle with the adverse effect of forcing a number of passengers to stay overnight in London (the passengers concerned might regard this as a catastrophe). The outcome of a failure of an aircraft auto-landing system could be much more serious. Note that it is not possible (with the above definition of failure) to build systems capable of undoing their own failures since this SYSTEM DEPENDABILITY AND RELIABILITY 31 would imply that, by some means, behaviour which deviated from that required by the specification could be transformed (after it had occurred) into behaviour which conformed to the specification.

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Fault Tolerance: Principles and Practice by Peter Alan Lee, Thomas Anderson (auth.)

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