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Computer Systems
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- 1Computer SystemA combination of hardware and software components that allow input, processing
and output of data. - 2HardwareThe physical components that make up a computer system.
- 3Input DevicesHardware that accepts data into the computer. They take real world analogue
data and convert it into a digital form that can be stored on a computer. For
example: keyboard, mouse, microphone, webcam, scanner, sensors. - 4Output DeviceHardware that presents the results of processing to the user or actuators that
perform a task automatically. They use digital data from a computer and produce
it in a form that is understandable or usable. For example: monitors, printers,
speakers, projectors, actuators (motors). - 5Storage DeviceHardware that is used to store fi les long term and is non-volatile, such as hard
disks, memory sticks, magnetic tapes and CDs - 6ReliabilityHow far you can depend on the computer system being available when you need
it. Usually measured in terms of availability - 7AvailabilityThe 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. - 8MTBFMean 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 - 9RedundancySpare 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) - 10Disaster 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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- Fichas sobre Computer Systems, creado por 090701sn el 12/06/2015.
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