BlogData centres
Power density planning per rack
By Vicky Ogola, Senior ICT Consultant 1 min read
How much power each rack draws determines cooling, circuits and PDUs. Plan density deliberately rather than discovering it.
Every watt a rack draws becomes heat that must be removed. Power density drives the whole design.
Measure or estimate the load
Use measured consumption where possible; nameplate ratings overstate typical draw.
Plan circuits and PDUs
Each rack needs circuits and PDUs that support its load with headroom, ideally fed from two independent sources.
Match cooling
Higher-density racks need more targeted cooling, such as in-row units or containment.
Spread the load
Distribute high-power equipment across racks rather than concentrating it where cooling cannot keep up.
Monitor
Metered PDUs show actual consumption per rack and reveal when limits approach.
Plan for the future
New servers and storage often draw more power per rack unit than the equipment they replace. When planning a new room, design power and cooling for the density you expect in several years, not just today's load.
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About the author
Vicky Ogola
Senior ICT Consultant
Vicky Ogola writes about network design, connectivity, data centres and the infrastructure that business systems depend on.