Data Center Site and Space Planning
Site Selection Fundamentals
Site planning balances natural hazard exposure, utility availability, connectivity options, latency to users, physical security, and expansion potential. Candidates should understand floodplain and seismic risk, proximity to fuel and power infrastructure, and fiber route diversity. Latency-sensitive workloads push toward edge or metro placement; batch and backup workloads tolerate remote sites.
Space Planning Inside the Hall
Master the vocabulary of white space: raised floor, hot and cold aisles, containment, structural floor loading, ceiling height for overhead infrastructure, and clearances for service. Know typical aisle widths, why cold-aisle containment improves cooling, and how row orientation affects cable routing. Understand power density per rack and how it drives floor tile perforation and cooling distribution. Plan for staging, storage, network rooms, electrical rooms, and mechanical yards - not just the IT floor.
Concepts to Master
- Gross vs. white space ratio and how support space consumes footprint.
- Floor loading limits (structural vs. equipment) and slab reinforcement needs.
- Growth phasing: design halls in modules so capacity tracks demand.
- Separation of power, network, and mechanical zones for safety and maintainability.
- Redundant utility entrances and diverse fiber paths.
Common Traps
Questions often test whether you account for support space - candidates forget electrical and mechanical rooms. Another trap: confusing raised-floor height requirements for airflow with structural clearance. Also watch for distractors that ignore hazard exposure in favor of cost alone.
Worked Example / Rule of Thumb
If total building area is 10,000 m² and white space is 55%, IT floor is 5,500 m². Rule of thumb: plan support and circulation space early; a common planning ratio is roughly 40–60% white space depending on redundancy and cooling strategy.