Saving electricity by suspending idle servers

Power reduces significantly in suspend/sleep mode (from 25 Watt to 5 Watt)

Electricity is a (very) expensive resource in Europe. By putting the servers into sleep/suspend mode (while idle), I can save 80% of the power consumption. A very-low-energy microcomputer (e.g. raspberry pi or even the smartphone) is enough to get them to wake up when being used.

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