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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.
which paradigm tend to correspond with top down and bottom up design
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Write about software change strategies. The software change methods that could be applied separately or together are: Software maintenance - The alters are made in the software
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What are Documentation standards? Particularly important - documents are the tangible manifestation of the software. Documentation process standards Concerned with how
Recovery/error testing is testing how well a system recovers from crashes, hardware failures, or other catastrophic problems.
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