Chapter 18 - Data Centers

Question 1

What is the availability class F0 for data centers?

Answer 1

F0 supports basic environmental and energy requirements of the IT functions without supplementary equipment. Capital cost avoidance is the major driver.
High risk of downtime. Maintenance can be performed during nonscheduled hours, and downtime of several hours or even days has minimum impact on the mission.

Question 2

What is the availability class F1 for data centers?

Answer 2

F1 has no component or system redundancy.
Annual maintenance windows: 100-400 hours
Targeted availability: 99 percent

Question 3

What is the availability class F2 in data centers?

Answer 3

Redundancy is provided for critical components.
Premium quality for critical components.
Annual maintenance windows; 50 to 99 hours
Targeted availability: 99 percent

Question 4

What is the availability class F3 for data centers?

Answer 4

Component redundancy is provided for critical and noncritical components.
Annual maintenance windows: 0 to 49 hours
Targeted availability: 99.99 percent

Question 5

What is the availability class F4 for data centers?

Answer 5

Component redundancy is provided for all critical components and also for noncritical components
System redundancy is provided so that overall reliability is maintained even during maintenance activities
Annual maintenance windows; zero hours
Targeted availability: 99.999 percent

Question 6

What is the maximum pathway depth for data centers?

Answer 6

Total max pathway fill is 50% of total available pathway, with maximum pathway depth of 150mm (6in)

Question 7

What is the maximum optical fiber patch cord pileup within a pathway for data centers?

Answer 7

No more than 50mm (2in) depth

Question 8

How much separation is needed between balanced twisted-pair cable and power distribution pathways in data centers?

Answer 8

Generally ~600mm (2ft) separation between twisted pair and electrical circuits.
Additionally, ~12.5mm (5in) separation is required between balanced twisted-pair cables and fluorescent lamps and associated fixtures

Question 9

What is the recommended minimum cable tray height in data centers?

Answer 9

Minimum height of ~2.75m (9ft) above finished floor

Question 10

What are the seven classes of potential for damage or loss at a data center?

Answer 10

• Temperature
• Gases
• Liquids
• Organisms
• Projectiles
• Movement
• Energy anomalies