An introduction to three-phase power and PDUs

This text discusses the importance of managing power in data centers and provides an overview of how Power Distribution Units (PDUs) work, along with some good practices on their use. It explains that a PDU is used to distribute power to multiple rack-mounted machines and can be accessed via SSH or webGUI for turning on and off power outlets. The text also delves into the concepts of Faraday's Law and Ohm's Law, which are relevant in understanding how AC power works in PDUs and servers. It further discusses 3-phase PDU systems, their advantages over single phase systems, and how to deal with 3-phase systems effectively. The text concludes by emphasizing the importance of hardware management and power reliability for Cloudflare's services.