HP Power Calculator Utility: a tool estimating power requirements for HP ProLiant rack-mounted systems

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HP Power Calculator Utility: a tool for estimating power

requirements for HP ProLiant rack-mounted systems

technology brief

Abstract.............................................................................................................................................. 2

Introduction......................................................................................................................................... 2

Key parameters ............................................................................................................................... 2

Input line voltage.......................................................................................................................... 2

Device VA rating.......................................................................................................................... 3

Device input power....................................................................................................................... 3

BTUs required for cooling.............................................................................................................. 3

Input/inrush current ...................................................................................................................... 3

Leakage current............................................................................................................................ 3

Determining power needs ................................................................................................................. 3

HP Power Calculators........................................................................................................................... 5

Developing the calculators ................................................................................................................ 5

Using the calculators ........................................................................................................................ 5

Example rack calculation...................................................................................................................... 7

Conclusion.......................................................................................................................................... 9

Do use the calculator for: .............................................................................................................. 9

Do not use the calculator for: ......................................................................................................... 9

For more information.......................................................................................................................... 10

Call to action .................................................................................................................................... 10

Summary of content (10 pages)

PAGE 1
HP Power Calculator Utility: a tool for estimating power requirements for HP ProLiant rack-mounted systems technology brief Abstract.............................................................................................................................................. 2 Introduction......................................................................................................................................... 2 Key parameters ...................................................................
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Abstract With power requirements of computing equipment continuing to increase and the cost of energy forever rising, IT organizations need to obtain accurate estimates of power and cooling requirements when designing and expanding data centers. The use of equipment nameplate ratings can yield inflated numbers that can result in overspending for power infrastructure components and a less efficient data center design.
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demand (kilowatt hours) on cooling systems while increasing equipment reliability. Some systems that can use either low-line or high-line power actually require high-line voltage to meet maximum performance specifications. Facilities may also distribute AC power as single- or three-phase. Threephase high-line power (such as 3-phase 208 VAC in the U.S.) is more efficient and recommended for systems requiring 3 kilowatts or greater.
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Nameplate ratings on power supplies typically represent the maximum amount of output power the supplies are capable of providing. Name plate ratings are typically based on the power needs of fully loaded servers configured for maximum processing and storage capability and running at 100 percent utilization. Since servers rarely are configured to their maximum and run at 100 percent utilization, estimating rack requirements using nameplate ratings would likely result in inflated power requirement numbers.
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HP Power Calculators The HP Power Calculator utility reduces the research and guess-work for determining power requirements of systems based on ProLiant servers. Each calculator provides precise data that planners can use to accurately predict power and cooling requirements for single systems and, consequently, for racks of systems. NOTE: HP Power Calculator is intended to be a conservative estimator of power. No two software programs will consume exactly the same amount of power.
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Figure 2 shows a partial screen of the Power Calculator for the HP ProLiant DL360 G5. The upper half of the screen provides an overview of the server model. The lower half of the screen provides the data fields for configuring the server as desired. Users can configure such parameters as level of input voltage; number, type, and speed of processors; amount of memory; number and size of hard drives; and types of expansion boards, all of which affect power consumption.
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Example rack calculation The HP Power Calculator utility provides accurate operating parameters that planners can use to predetermine the worst-case power requirements of a populated rack. In the following example, the HP ProLiant DL380 G5 server is the key component type to be installed in a standard 42U rack.
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While a standard 42U rack can physically accommodate 21 ProLiant DL380 G5 servers, it is advisable to allow space for server expansion, power distribution components such as PDUs and UPSs, keyboard/video/mouse (KVM) equipment, or networking components. Figure 4 shows a rack configuration of 16 servers with redundant power.
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Conclusion The HP Power Calculator is a valuable utility for planning systems based on HP ProLiant products. The calculator provides meaningful estimates of power for use in sizing an infrastructure. It is important to note, however, that actual power consumption of an installed system running certain applications may vary.
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For more information For additional information, refer to the resources listed below. Resource HP Power Calculator Catalog Hyperlink http://h30099.www3.hp.com/configurator/powercalcs.asp or www.hp.com/go/bladesystem/powercalculator HP UPS and PDU Sizer http://www.upssizer.com/ HP rack and power products http://h18004.www1.hp.com/products/servers/platforms/rackan dpower.html HP Site Preparation Utility http://h30099.www3.hp.com/configurator/calc/Site%20Preparation %20Utility.