Modern computers use multiple units that does the same function. These multiple functional units may work simultaneously resulting in higher throughput. Such systems improves the reliability because even if there is a failure of one or more units, the system can continue to function but with a less throughput. Thus the entire system will not be down. Many servers use this technique. There will be more than one server running in parallel. Output from only one will be considered. In case there is a failure of one server another server automatically take over.
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