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Learning Ceph - Second Edition by Karan Singh, Vaibhav Bhembre, Anthony D'Atri

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Power requirements-amps, volts, and outlets

In the US, standard outlets are 110-120V, 60 Hz, with NEMA 5-15 plugs, rated at ~ 1,875 watts. Other parts of the world use different standards, but the ideas apply. Many (but by no means all) small to medium and even large data centers and server installations use the local common standard. Servers today often incorporate power supplies that can handle a range of input voltages and frequencies, requiring only a localized power cable to adapt to the proper plug/socket type.

Some larger storage appliances, disk arrays, and even certain dense servers, however, may require (US) 240V power that may not be readily available in your data center. Even servers that accept conventional power may pull so ...

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