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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.
iii. Layered software architectures can be used to reduce coupling between the functions of a system that are closer to the machine and those that are closer to user needs. Why is
Aim The aim of this Assignment is to demonstrate knowledge about the analysis and design of a software system and understanding of the application of an object-orient
Question: a) List and explain three project Estimation techniques. b) During an estimation exercise, a work breakdown structure (WBS) is used as checklist for the activitie
What are the common activities in design process? i. System structuring - The system is subdivided into principle subsystems components and communications among these subsystem
What is Dynamic and static metrics? Dynamic metrics are closely related to software quality attributes It is relatively easy to measure the response time of a system (per
Communicational cohesion : Communicational cohesion is when parts of a module are grouped because they operate on the similar data (e.g. a module which operates on the similar reco
Software metric Any type of measurement which relates to a software system, process or related documentation Lines of code in a program, the Fog index, number of person-days
Software project planning entails what activities? Software project planning entails the many activities: - Estimation: o Effort, , resource, cost and project duratio
Explain the waterfall model. Waterfall Model: The waterfall model is a sequential software development model, in which progress is seen as flowing steadily downwards (such a
Question: (a) The relationship between organisations and information technology is a complex one, and is made up of a number of mediating factors which must be considered prior
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