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Was ist ein Rack?

Der Schrank, in dem Server im Rechenzentrum stehen.

A rack is a standardised cabinet for servers and network equipment. Its width is 19 inches (482.6 mm). Devices are slid in and screwed in place.

Terms

U (rack unit, "HE" in German): The height of a rack is measured in U. One unit is 44.45 mm. A server with 1 unit is very flat; 2-unit or 4-unit chassis are common.
Full rack: A complete rack with 47 units that you have to yourself.
Partial rack: Part of a rack, e.g. 1/4 or 1/2. The size is given in units.
PDU (power distribution unit): A strip in the rack that distributes power to the devices. Devices with two power supplies connect to two separate power circuits.

What does colocation mean?

With colocation, you place your own hardware in a provider's data center. The provider supplies power, cooling, network connection and access control. You own and operate the devices.

A rack is not the same as a server. The cabinet only provides space and a power connection. The customer chooses and maintains the hardware.