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A Rack PDU: What Is It?

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The final component of the power chain, rack power distribution units (rPDUs), assure the supply of vital power to IT loads. The data canter’s rPDU is made to provide electricity to various kinds of IT equipment.vertiv rack pdu

Instead of producing electricity, the rPDU disperses it from the available power source. The rPDU is connected to an upstream Power Distribution Unit (PDU), also known as a floor PDU, in a typical data centre setup. When everything is running normally, the floor PDU distributes electricity from the utility. Uninterruptible power supplies (UPS) take over the power load during a power loss while the generator starts up to start powering the facility. The floor PDU divides the available power into circuits so that energy may be delivered around the building. It functions similarly to your home’s circuit breaker panel.

In the event of a utility power outage, the generator provides redundancy. The floor PDU is where power is routed throughout the building, and the rPDU is linked downstream. The IT equipment within each cabinet and rack is subsequently given power via the rPDU.

The rPDU can manage and regulate the power consumption of several devices in data centre environments. It can be accessed remotely or through a local network and can distribute massive quantities of power. rPDUs have the capacity to handle larger power densities and can withstand higher temperatures to satisfy the constantly evolving demands of the data centre. Some rPDUs are easily upgradeable and maintainable without requiring power to be removed from the attached devices, preventing compromises to fundamental power distribution. These features reduce downtime and come with help from the manufacturer to adhere to service-level agreements (SLAs).

Why are Rack PDUs necessary?

Many firms are placing pressure on data centre managers to increase availability while lowering costs and enhancing efficiency as data centre environments grow more dynamic and complex. The need for larger rack densities and overall facility power consumption has grown with the introduction of new high-density servers and networking equipment. While densities around 10kW per rack continue to be the norm, hyperscale facilities often deploy above 15kW, and some are even getting close to 25kW. Performance and capacity are increased with high-density layouts, but this necessitates a more efficient power supply. In order to ensure effective power distribution and adapt to changes in data centre capacities and densities, the capabilities and functionality offered by an rPDU become more and more crucial.

Power Requirements

Identifying the power needs for the vital IT equipment that will be connected is the most crucial consideration when choosing an rPDU. The power provided to the data centre management could be its only constraint. In contrast, in some circumstances, the data centre management may have control over the power sent to the rack. If the data centre manager has the power to choose the power, he or she should choose the approximate kW required for the deployed equipment. The data centre manager can choose the proper rPDU power configuration since the power needed will supply the bare minimum power needed for the equipment in the rack. The data center manager can then instruct an electrician to connect the required electricity to the rack that houses the rPDU using the proper connector. On the other hand, if the data center manager is restricted to the power that is already available, he or she will need to identify the receptacle type the rPDU will need to plug into. Depending on the power available, the cabinet density could be limited or additional rPDUs will need to be deployed in the same cabinet to reach the power capacity required for the deployed equipment.

Power Configuration

Depending on the worldwide location where the units will be put, several rPDU power configuration choices will be offered. There are choices for various voltages, amperages, and single-phase and three-phase electricity. Single-phase or three-phase electricity can be routed throughout a data centre. Although single-phase electricity is more frequently utilised in households and small companies, three-phase power may also be delivered in data centres. Since three-phase power is more effective and enables larger densities, it is commonly used in high-density data centres. The power supply and the power requirements of the connected devices determine what is optimal. Power choices for the rPDU range from 100V single-phase to 240/415V three-phase, and current ratings range from 10A to 120A.

Horizontal Mount vs Vertical Mount

Rack PDUs can be installed within or outside the rack enclosure, horizontally or vertically. In the rack, horizontal rPDUs are mounted and occupy space; they generally take up 1U or 2U of space and have 8–16 outlets. The vertically mounted rPDUs have a 54 outlet capacity. To avoid occupying valuable equipment mounting space inside the rack, they are mounted on the back or side of the enclosure for the rack. Before choosing the mounting solution for the rPDU, it might be helpful to understand your data centre space and IT equipment to assist save money, time, and space.