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原帖由 lemonctp 于 2011-11-4 11:57 发表 
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机房没有空调吗
Greenhouse gas emissionsIn 2007 the entire information and communication technologies or ICT sector was estimated to be responsible for roughly 2% of global carbon emissions with data centers accounting for 14% of the ICT footprint.[36] The US EPA estimates that servers and data centers are responsible for up to 1.5% of the total US electricity consumption,[37] or roughly .5% of US GHG emissions,[38] for 2007. Given a business as usual scenario greenhouse gas emissions from data centers is projected to more than double from 2007 levels by 2020.[36]
Siting is one of the factors that affect the energy consumption and environmental effects of a datacenter. In areas where climate favors cooling and lots of renewable electricity is available the environmental effects will be more moderate. Thus countries with favorable conditions, such as: Canada,[39] Finland,[40] Sweden[41] and Switzerland,[42] are trying to attract cloud computing data centers.
In an 18-month investigation by scholars at Rice University’s Baker Institute for Public Policy in Houston and the Institute for Sustainable and Applied Infodynamics in Singapore, data center-related emissions will more than triple by 2020. [43]
[edit] Energy efficiencyThe most commonly used metric to determine the energy efficiency of a data center is power usage effectiveness, or PUE. This simple ratio is the total power entering the data center divided by the power used by the IT equipment.
Power used by support equipment, often referred to as overhead load, mainly consists of cooling systems, power delivery, and other facility infrastructure like lighting. The average data center in the US has a PUE of 2.0,[37] meaning that the facility uses one Watt of overhead power for every Watt delivered to IT equipment. State-of-the-art data center energy efficiency is estimated to be roughly 1.2.[44] Some large data center operators like Microsoft and Yahoo! have published projections of PUE for facilities in development; Google publishes quarterly actual efficiency performance from data centers in operation.[45]
The U.S. Environmental Protection Agency has an Energy Star rating for standalone or large data centers. To qualify for the ecolabel, a data center must be within the top quartile of energy efficiency of all reported facilities.[46]
European Union also has a similar initiative: EU Code of Conduct for Data Centres[47]
Datacenter energy costs outpacing hardware prices
http://arstechnica.com/business/ ... hardware-prices.ars
Nearly all of the speakers recognized that, from a market perspective, building an efficient datacenter is increasingly critical. Jonathan Koomey, who's affiliated with LBL and Stanford, said that power use by US datacenters doubled between 2000 and 2005, despite the fact that the period saw the dot com bust. Uptime's Kenneth Brill told the audience that, currently, the four-year cost of a server's electricity is typically the same as the cost for the server itself, while John Haas of Intel said that 2010 is likely to be the point where the electricity costs of a server over its lifetime will pass the price of the hardware.
The price for power also tends to get magnified at the datacenter level. Haas said that, based on his company's estimates, one watt saved at the server can save 2.84W at the datacenter level, while Google's Chris Malone claimed that cooling dominates the additional costs, running at about twice the cost of everything else combined. When the additional infrastructure costs are considered, Brill said, the minimum capital expenditure for a $1,500 server has now cleared $8,000 when the power and air conditioning infrastructure is considered. "Profits will deteriorate dramatically if datacenter costs don't get contained," he concluded |
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挑选初学者钢琴 (2008-9-18) daffodil 
楼主:yuba
发表于 2011-11-4 12:56
