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importance of computers
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- 1ReliabilityHow far you can depend on the computer system being available when you need
it. Usually measured in terms of availability. - 2AvailabilityThe proportion of time that a system is operational, usually expressed as a
percentage over a period of time. E.g. 95% measured over one year - 3MTBFMean Time Between Failure: a measure of availability often quoted by hardware
manufacturers. For example 2.56 years between failures means that, on average,
the hardware can be expected to last 2.56 years before it goes wrong. - 4RedundancySpare hardware components are built into a system so that, in the event of a
component failing, the system can swap over to the spare one.
(Discussed in Chapter 6: Networks) - 5Disaster RecoveryWhere a company has plans to replace a system quickly if there is a catastrophe
(fi re, fl ood, bomb etc). Designed to minimise the time the system is down.
(Discussed in Chapter 6: Networks)
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