Why do server racks need power?

In it's most basic form, yes.

Get a managed PDU and it will have an Ethernet port. That lets you do various tasks such as look at power consumption and remotely power off/on individual sockets to reboot hung devices. Ideal for equipment you might need to reboot but don't have on-site people to do it.

Okay cool.. So what does the PDU connect into for its power source?
 
In a small environment, it could go directly into a UPS in the same rack. Or, if the equipment isn't super important to keep going during a power-cut, directly into the mains.

In larger DCs, the UPSs are shared between multiple racks.

So I'm guessing a UPS connects to the mains? Then if power from the mains goes out the UPS (connected to the PDU) kicks in?
 
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