... they are able to replace it, without any down time. The only time the server would go down would be in the case of a Power Supply Unit failing, and this can be fixed in a matter of minutes. In the computer centre all the computers are connected to a UPS and surge protection, in the form of sockets around the centre. The surge protection will stop computer components being damaged due to a spike on the national grid, and the UPS will take over if there is a power cut. The UPS can provide power to the servers in the computer centre for a considerable amount of time. The smaller servers all have a small UPS, and these are configured to shut the server down if the power is off for any longer than 10 minutes. This means that all unsaved files are saved to the hard disk. ...

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