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Frequently Asked Questions
What is a Tier III data center?
A Tier III data center meets Uptime Institute standards for N+1 redundancy on all power and cooling paths, with no single point of failure. Tier III facilities achieve 99.982% uptime (1.6 hours downtime/year) and support concurrent maintainability — meaning any component can be serviced without taking the facility offline. Most enterprise-grade colocation providers operate Tier III or Tier IV facilities.
How much does it cost to build a data center?
A small enterprise data center (500 kW IT load) costs $8M–$15M to build. A mid-size facility (5 MW) runs $50M–$100M. Hyperscale facilities (100+ MW) cost $500M–$1B+. Cost drivers include power infrastructure (30–40% of budget), cooling (20–25%), building/civil (20–25%), and IT infrastructure (15–20%). DCS Global provides detailed cost modeling as part of our feasibility assessment service.
What is PUE and what is a good PUE?
Power Usage Effectiveness (PUE) measures data center energy efficiency: total facility power divided by IT equipment power. A PUE of 1.0 is perfect efficiency. Industry average is 1.58. Best-in-class hyperscale facilities achieve 1.1–1.2. For enterprise data centers, 1.3–1.4 is excellent. PUE above 1.8 indicates significant cooling and power distribution inefficiency.
What is the difference between a data center and a server room?
A server room is a small, dedicated space (typically under 100 square feet) housing IT equipment for a single organization, with basic cooling and power. A data center is a purpose-built facility with engineered redundancy, dedicated power infrastructure (UPS, generators), precision cooling, physical security, and 24/7 operations staff. Data centers are designed for continuous operation; server rooms are not.
Key Terms
The ratio of total data center power consumption to IT equipment power consumption. Lower is better; 1.0 is perfect efficiency.
Uptime Institute's four-level system for rating data center infrastructure reliability, from Tier I (basic) to Tier IV (fault-tolerant).
Software that monitors, measures, and manages data center infrastructure including power, cooling, and IT assets.
A data center layout that separates hot exhaust air from cold supply air by alternating rack orientations, improving cooling efficiency.
A redundancy model where N components are required for operation and one additional component provides backup. If any component fails, the system continues operating.
Buyer\'s Guide
Questions to ask when evaluating data centers solutions.
Why it matters: Tier III provides 99.982% uptime; Tier IV provides 99.995%. The difference is 14 hours vs. 26 minutes of downtime per year. Mission-critical workloads require Tier III minimum.
Red flag: Facilities that claim "Tier III equivalent" without Uptime Institute certification.
Why it matters: Standard colocation provides 3–5 kW/cabinet. AI and HPC workloads require 10–30 kW/cabinet. Deploying high-density compute in under-provisioned facilities causes thermal failures.
Red flag: Providers who cannot provide per-cabinet power metering and cooling capacity documentation.
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