Which Of The Following Statements Are True Of An Infrastructure Inventory Or Registe

Data center design and infrastructure final test

This quiz tests cognition about data center design, site selection, power and cooling and other material related to the data centre'south physical infrastructure.

Cull the best reply to each question so click the "Check Score" button at the bottom of the page to view your score. Incorrect responses will exist displayed carmine. View explanations and references to each question by post-obit the "Bank check answer" link. Proficient luck!

1. Co-ordinate to a enquiry study by the Princeton, N.J.-based site pick specialists, The Boyd Visitor Inc., at that place are three major factors affecting the conclusion of where to build a data center. Based on these factors, which region in the U.Due south. seems to exist the most logical place to build a data center?

a)The due east and west coasts-Despite college costs in other areas, the talent pool justifies the expense.
b)The northen midwestern states-Power is cheaper and natural disasters are fewer.
c)The southward-Cheap labor and inexpensive real estate trumps the threat of natural disasters.
d)Pacific noncontiguous (Alaska and Hawaii)-It'south where ability is the cheapest, right?

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2. Sun's Rob Snevely talks about rack location units (RLU) in information centre blueprint. Why are these important?

a)RLUs are part of a information heart monitoring software that assigns locations to server racks, making information technology easier to monitor them.
b)RLUs are devices fastened to server racks by the facilities department that help them keep an estimate of how many servers are existence brought into the data eye.
c)RLUs are a style to describe whatsoever particular location on the floor -- including requirements for power, cooling, bandwidth, weight -- and then you lot can do chapters planning.
d)They are not important to data eye design.

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iii. HP is planning to consolidate 85 worldwide data center facilities down to half-dozen, taking HP's data eye real estate down from 500,000 square feet to 300,000. What is cited as a major, but oftentimes unsung, component to their consolidation strategy?

a)Application consolidation -- it's a huge cost saver in licensing, management resources and hardware support.
b)Losing the raised floor and going with a loftier-density approach to computing and cooling.
c)Decreasing the size of the staff -- this will force the It department to prioritize projects and piece of work smarter, not harder.
d)Architecture diversification -- This allows IT to optimize applications and weed-out unnecessary programs.

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4. According to founder and executive director of The Uptime Institute Ken Brill, sealing the cable openings at the dorsum of racks and taking perforated tiles in the hot aisle and putting them in the common cold aisle are two strategies that practice what in a typical data heart?

a)Doing this increases bypass airflow, which results in improve airflow direction.
b)Doing this enables data eye staff to isolate hot spots, so more cooling units tin can be brought in to address the trouble.
c)Doing this increases that data middle temperature and is non recommended -- these are strategies that have been tested, but have had negative results.
d)Doing this reduces featherbed airflow, which results in getting the air to where information technology needs to become.

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v.Though backup power from flywheel technology is not a new concept, UPS providers are increasingly becoming interested using flywheels either as an alternative to or in tandem with the traditional battery UPS. Why?

a)Batteries' shortcomings are due to their limited lifetime -- using a flywheel to reduce bombardment cycles tin extend the overall life of the backup system.
b)This is non actually true -- flywheels depend on the primary source to begin spinning, rendering them less efficient because of this initial power consumption.
c)The mechanical nature of flywheels makes them a favorable choice to the chemical processes of batteries.
d)This is non really true -- flywheels don't provide continuous power to make them useful at this betoken.

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six.Free energy efficiency is not only socially more than responsible, it's ecnomomically mandatory. According to APC's Neil Rasmussen, what areas of the data centre accept the biggest margin for improvement?

a)Servers -- Expanding EPA's the Energy Star plan to include servers will have the nearly dramatic issue on energy efficiency in the data center.
b)Data center pattern -- IT departments tend to over-size and count on their companies expanding to capacity; in the meantime, they're inefficient.
c)CRAC units -- Nosotros need to more than past forced-air cooling and use water because water is a more than efficient medium for removing estrus.
d)If information center staff would just turn the light off when they're not in the data center, they would take a huge touch on on efficiency.

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vii.True or False -- The following statement accurately describes the bones procedure for measuring server free energy consumption of 1 and 2U machines as currently put forth past server industry participants:

Server frequency, voltage, power factor and total harmonic distortion are measured and compared to CPU utilization. A curve with power output on the y-axis and pct of workload on the x-axis is created. Measurements for workload are in x% increments from 0% to 100%, allowing data center managers to examine the curve depending on how busy they expect their servers to exist.

a)True
b)False

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8. In the search for more efficient means to use available power, some companies are exploring, and fifty-fifty implementing, direct current (DC) every bit opposed to alternating current (Ac) systems. All the same, in that location are pros and cons to both approaches. Which of the post-obit statements are true concerning this debate?

a)AC-powered systems are more efficient because they only require the power to be converted once, avoiding energy loss.
b)DC ability is easier to move over long distances, making it a more applied option.
c)Both a and b are true.
d)Neither a or is true.

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9. Hydrogen fuel cells tin can provide clean and reliable energy without some of the limitations of more than traditional power supplies. But there are concerns about certain aspects of hydrogen fuel cell engineering science. Which of the following statements is true most hydrogen fuel cells?

a)The upfront cost of purchasing and installing a PAFC today is much higher than the price of a diesel fuel generator or gas turbine, but the 20-year payback is comparable due to the fuel jail cell'southward lower maintenance and improve efficiency.
b)Hydrogen fuel cells as a backup power organisation may exist favorable selection when conventional systems aren't permitted, such every bit an alternative to a diesel generator because of structural, noise, planning or emissions restrictions.
c)Hydrogen fuel prison cell power is currently impractical co-ordinate to some experts because hydrogen is yet manufactured from natural gas -- a dirty process -- and using electricity to separate the hydrogen is less efficient than simply using electricity in the kickoff place.
d)All of the above are truthful.

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x.According to data eye power and cooling skillful Robert Macfarlane, what is the biggest problem in determing what size of UPS to go with?

a)Most manufacturers do not provide adequate power information on their equipment, making information technology difficult to determine actual load.
b)Equipments' power factor (pf), or ratio of reactance power versus actual bachelor ability, is rarely stated on equipment.
a)The lack of continuity in ability cistron (pf) rating between American and European manufacturers is the biggest trouble -- in the U.S., it is assumed to be between 1.0 and .8 versus the European rating of .95 to .98.
a)Determing what vendor to purchase equipment from is ever the most difficult part.

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xi.Air side economizers, which bring in libation outside air to lower that data center's temperature, have the potential to save companies a lot of coin on cooling. But there is also a lot of skepticism well-nigh the viability of air side economizers from people like cooling expert Steve Madara and ASHRAE member Don Beaty. Which of these concerns have been cited?

a)Contaminants similar pollen or construction dust.
b)Conditioning the outside air to the appropriate humidity level potentially negates the free energy saved by using air side economizers.
c)Air side economizers are only applied for specific geographies.
d)All of the above.

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12.Raised floor cooling has been the standard for many years. But during the late 1990s, many companies started experimenting with overhead cooling, claiming that handling IT equipment was easier if the cabling was overhead, and the influx of smaller servers made water pipe unnecessary. In an IBM written report, researchers compared the methods. What were the findings?

a)Both cooling strategies provided similar amounts of cooling with irrelevant levels of variance.
b)With chillers operating at 100% and 80% levels, overhead cooling resulted in cooler rack intake temperatures.
c)With chillers operating at 100% and 80% levels, raised-floor cooling resulted in libation rack intake temperatures.
d)The results were largely inconclusive.

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13.Additional cooling units aren't ever the answer to mitigating hot spots. Air commitment has everything to do with the power of ACs to bring downward the temperature in a data center. According to Bob Macfarlane, there are three primary causes of poor air delivery: Bypass air, air leakage, and ______. According to Syska Hennessy researchers Christopher Johnson and Vali Sorell, ___ modeling may assistance data centre designers in locating these air delivery failures.

a)overhead cooling, UPS
b)nether-floor blockage, CFD
c)filtration, PF
a)high-density servers, CFM

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14.Using Bob Macfarlanes formula for determining cubic feet per minute (CFM), how many CFMs will be required to cool the following configuration (practise not include correction factor):

10 blades at 300 Watts each
Entering air is 50 degrees
Exiting air is 80 degrees
a)100 CFM
b)265 CFM
c)340 CFM
d)none of the to a higher place.

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15.At that place are many facets to the liquid versus air cooling debate. On one hand, ASHRAE TC 9.9'southward Don Beaty says that because h2o is three,500 times more efficient than air, we'll accept to brand the move to water to maximize cooling efficiency. On the other, APC'south Neil Rasmussen says that the dynamic nature of enterprise data centers makes information technology impractical to use build a liquid cooling infrastructure. But fifty-fifty within the liquid cooling camps, at that place are dissimilar approaches. Which of the following statments describes IBM'southward Absurd Blue pick?

a)Liquid is delivered directly to the rack. One time the liquid is within the vicinity of the rack, it is then used to absurd air locally, which in plough cools the equipment.
b)Pumps in an inert liquid and sprays it straight onto the hot fleck to absurd it down.
c)Enables server racks to consume up to 3 times equally much power as its existing racks -- upward to a staggering xxx kilowatts -- while keeping temperatures at safe operating levels.
d)Removes up to 55,000 BTUS of heat from fully populated server racks and potentially lowers free energy costs every bit much as 15 percent.

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