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Blade system chassis, modules, and the blades themselves come in many different flavors. Choosing the right vendor, the right chassis, and the right blades requires a thorough assessment of your needs, as well as careful planning. This chapter offered a variety of questions to ask yourself and your potential vendors about various blade system options and how they address your unique environment and requirements. It also provided considerations and tips to help with your blade implementation. The next chapter, Power and Cooling, moves from hardware considerations to facilities and environmental factors chief among these are power and cooling. 13 offers an introduction to power and cooling issues, and offers suggestions for tackling these all-important matters.
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Power and Cooling
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This chapter discusses power and cooling requirements and considerations for implementing blade systems. It also offers tips on how to prepare your data center for a smoother implementation. According to an IDC study of end-user perspectives, power was the topranked issue facing user data centers (see Figure 13.1). Why is power such a pressing concern Data-center electricity costs are greater than $3 billion per year, and IDC predicts that the number of servers in the United States will grow 50% over the next four years. Furthermore, businesses paid 20% more for electricity in 2005 than they did in 2004, with rates in some areas jumping more than 40%. According to Robert Frances Group, power, cooling, and electricity together comprise 25 40% of a data center s annual operating cost. To understand power and cooling discussions, it is helpful to review basic terms such as volts, amps, watts, and BTUs, and clarify them with an analogy. Voltage (volts) can be viewed as the size of the pipe bringing in the power. Amperage (amps) is the flow rate within the pipe, or how fast the power flows. Wattage, then, (measured here mostly in kilowatts, or kW) is the total amount of power delivered, calculated as voltage times amps. This is how power requirements for blade chassis and racks are typically given. Since power also equates to heat, wattage in equals wattage out (for example, if the power requirement is 30 kW, the heat generated is also 30 kW. Cooling can then be estimated in BTUs (British Thermal Units) as wattage times 3.41. Cooling requirements are often quoted in BTUs.
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Figure 13.1: End-user perspective data center issues ranked by importance
Source: IDC, End User Perspectives on Server Blade Adoption, Doc #TB20060525, May 2006
In a Data Center Users Group survey in fall 2005, 67% of the data centers surveyed were already using high-density servers, with an average peak load per rack of 9 kW of power. (As of 2007 blade power requirements are more like 30 kW per rack and increasing.) The average wattage was 55 watts per square foot. Most (94%) had generator power, with less than half having any DC power. In terms of cooling issues, as more power is required to run the system, more heat is generated. This translates into paying once to power the servers and paying again to cool them. A rack that uses 24 kW of power requires about 78,000 81,000 BTUs of cooling capacity. Airflow is another key aspect of cooling servers, measured in cubic feet per minute (cfm). According to power and cooling vendor APC (American Power Conversion), blade server systems need 120 cfm of cool air per kW of power. Most data centers to date provide 200 300 cfm of cool air per rack location, which is about 10% of what s required. If no additional cooling is used, this would limit rack power to less than 2 kW per rack, and blades would not be an option. The ultrahigh density of blade systems has raised power and cooling issues to a new level. However, contrary to what many people believe initially, the problem with blades is not power and cooling, but rather the distribution of power and cooling to the places where they are most needed.