CDCS Environmental Monitoring & Sustainability 3

Question 1

What is DCiE (Data Center infrastructure Efficiency) and how does it relate to PUE?

Accepted Answer

DCiE is the inverse of PUE expressed as a percentage, showing what fraction of power reaches IT equipment

Answer

DCiE measures the efficiency of individual servers rather than the overall facility infrastructure

Answer

DCiE replaces PUE as the primary efficiency metric specifically for Tier IV certified data centers

Answer

DCiE measures the ratio of cooling power consumption to total IT equipment power consumption

Question 2

What is the main risk associated with airside economization (using outside air for cooling) in a data center?

Accepted Answer

Introducing contaminants, uncontrolled humidity, and temperature extremes that can damage IT equipment

Answer

Consistently exceeding ASHRAE temperature limits during summer months in all U.S. climate zones

Answer

Reducing airflow velocity below the minimum required for adequate server thermal management

Answer

Creating static electricity buildup from dry outdoor air that can damage sensitive electronic components

Question 3

In the context of data center environmental sustainability, what is 'stranded capacity'?

Accepted Answer

Cooling or power infrastructure that is provisioned and consuming energy but not supporting active IT workloads

Answer

Emergency power reserves maintained on standby exclusively for disaster recovery activation scenarios

Answer

Dedicated cooling systems allocated specifically to battery backup and UPS power units

Answer

Network bandwidth reserved for environmental monitoring sensors and DCIM system communications

Question 4

Which standard or program provides environmental ratings for IT equipment procured for data center deployments?

Accepted Answer

EPEAT (Electronic Product Environmental Assessment Tool)

Answer

LEED for Existing Buildings Operations and Maintenance rating

Answer

Energy Star for Industrial Facilities certification program

Answer

ISO 14064 greenhouse gas quantification and reporting standard

Question 5

What is the recommended minimum average server utilization rate for an environmentally efficient data center?

Accepted Answer

40-60%

Answer

10-20%

Answer

80-95%

Answer

5-10%

Question 6

What primary environmental advantage does direct liquid cooling (DLC) offer over traditional air cooling in high-density data centers?

Accepted Answer

Significantly higher heat transfer efficiency, reducing total cooling energy and enabling greater rack densities

Answer

Complete elimination of water consumption compared to air-side evaporative cooling systems

Answer

Reduced need for raised floor infrastructure, saving construction materials and data center space

Answer

Lower ambient noise levels throughout the facility, improving environmental working conditions

Question 7

Which framework is most commonly used by large data center operators to report environmental impact to stakeholders?

Accepted Answer

GRI (Global Reporting Initiative) Standards

Answer

ANSI/BICSI 002 data center design and implementation standard

Answer

TIA-942 telecommunications infrastructure standard for data centers

Answer

ASHRAE TC 9.9 thermal guidelines for IT equipment environments