General Flashcards

Which metric measures the ratio of IT equipment power to total facility power consumption in a data center?

Answer: Power Usage Effectiveness (PUE)

PUE is the standard metric defined by The Green Grid that divides total facility power by IT equipment power.

What does the 'N+1' redundancy model mean in data center design?

Answer: One extra component beyond what is needed for normal operation

N+1 redundancy means one additional component beyond the minimum required (N) to handle failure of any single unit.

What is the standard hot-aisle/cold-aisle arrangement in a data center?

Answer: Server fronts face each other, backs face each other

Hot-aisle/cold-aisle containment places server fronts (intake) facing cold aisles and server backs (exhaust) facing hot aisles.

According to ANSI/TIA-942, what is the highest data center tier classification?

Answer: Tier IV

Tier IV represents the highest level with fault-tolerant infrastructure allowing 99.9995% availability and simultaneous maintainability.

What is the primary function of a Computer Room Air Handler (CRAH) unit?

Answer: To cool server rooms using chilled water from a central plant

CRAH units cool data center air by circulating it over coils supplied with chilled water from a central chiller plant.

Which type of Uninterruptible Power Supply (UPS) technology provides the highest level of power protection with zero transfer time?

Answer: Double-conversion (online) UPS

Double-conversion online UPS continuously converts AC to DC and back, keeping loads isolated from the raw utility with zero transfer time.

What is the purpose of a Meets Point of Entry (MPOE) in a data center?

Answer: The demarcation point where external network carriers hand off to the building owner

The MPOE is the physical point where external telecommunications carriers terminate their service and responsibility transfers to the building owner.