March 2003
Intermediate to advanced
912 pages
27h 17m
English
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15.2. A model of a crash
A simple model of a crash will be taken initially, a fail–stop model. We shall assume that a crash happens at some instant rather than over a period of time. It results in the instantaneous loss of volatile state: the processor registers, the cache and memory management unit, and the (volatile) main memory. Any changes that have been made to persistent state, for example in any non-volatile memory and disk-based storage, are assumed to be correct, but may be incomplete. By making this simplifying assumption we avoid considering how incorrect system software may behave before finally causing a crash. In Section 15.7 we take a more realistic look at the likely behaviour of failing software.
Schlichting and Schneider (
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