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QUESTION - Fault Tolerance
(a) Three computers together provide a replicated service. The manufacturers claim that each computer has a mean time between failure of five days; a failure typically takes four hours to fix. What is the availability of the replicated service?
(b) In the gossip architecture, why does a replica manager need to keep both a ‘replica' timestamp and a ‘value' timestamp?
(c) Explain the difference between linearizability and sequential consistency, and why the latter is more practical to implement, in general.
(d) Explain why allowing backups to process read operations leads to sequentially consistent rather than linearizable executions in a passive replication system.
Q. Explain acceptance testing and beta testing? Acceptance Testing as well as Beta testing: System tests are designed to authenticate a fully developed system to guarantee th
Throw-Away Prototyping: Also known as close ended prototyping. Throwaway or Rapid Prototyping refers to the formation of a model that will eventually be discarded rather than beco
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Determine the Higher order programming languages Higher order programming languages such as COBOL and PASCAL came into existence. Use of these made programming much easier. In
what effect does memory have on dma? what about on board cache? how much are the system buses available?
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