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{panel:title=How to Create the Energy Efficient Datacenter: The Role of Modularity in Design and Deployment|titleBGColor=#F8D583|bgColor=white|borderStyle=solid}
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Please *[*view recorded presenatation of this webinar*|http://www.eseminarslive.com/c/a/IT-Infrastructure/Sun031309/]* cosponsored with Ziff Davis Enterprise\!
Featured Speakers
Dean Nelson - Director, Global Lab & Datacenter Design Services - Sun Microsystems, Inc.
Michael Krieger - VP, Market Experts Group - Ziff Davis Enterprise
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{panel:title=Please submit your questions for the speakers by adding a comment to this page. We will make sure that no questions are left unanswered!|titleBGColor=#F8D583|bgColor=white|borderStyle=solid}
*Q*: Is this sun hardware specific?
*Serena DeVito*: This approach is not hardware specific and can be adapted to any type of system irrespective of vendor as it is based upon rack averages and system density.
*Q*: How does the cfm measures with each sq footage of cabinet power? what is the formula to figure cfm per square footage?
*James Monahan*: BTU = 1.08 x CFM x Temperature Rise across the server (degF). 1 BTU = 3.412Watts If we are looking at a new datacenter we have to make an assumption based on the kW/rack design. We typically use 20 - 25 degF in our newer datacenters to overcompensate a bit. Hope that answers your question.
*Q*: Hot or cold aisle, which one is better. To me cold aisle seems easier as you control with the amount of air the equipment breathes. Any experience ??
*James Monahan*: We use both and there are advantages to both. The advantages of Cold aisle containment is that its easier to retrofit into existing environments with raised floors and perimeter CRACs. With cold aisle containment you can raise the supply air temp from the CRACs because this would be typically set a couple of degrees lower to allow for mixing to get the correct temperature in front of the racks. The advantage of Hot Aisle Containment is that its easier to put into new environments and the room is cold so in the event of a power outage this acts as a resvoir of cold air for the servers to pull off while the chillers get recharged. Also with HAC and chilled water units you get higher capacity from the units as they are seeing higher temperatures. This is a long discussion but I hopes this gives you an idea.
*Q*: Going back to your last slide, are the racks positioned front to back? How do you perform maintenance on the equipment in this configuration?
*Serena DeVito*: We align the racks in a hot aisle (backs of racks facing each other) and cold aisle (fronts of racks facing each other) configuration. We usually allow for a 4ft (minimum) for the cold aisle to be able to pull systems out for maintenance, and a 3ft (minimum) for the hot aisle.
*Q*: Do you know whether these busway solutions (which are VERY interesting) provide any kind of monitoring capabilities? Or are they pretty much passive?
*Serena DeVito*: There are busway monitoring solutions available and we use these as a tool to watch the loading across the phases (important for adding hardware and balancing), and to have a view into the utilization of a space as well as for calculating PUE. The ones we use are networked and can be integrated into a BMS system.
*Q*: Regarding power distribution, do you do power monitoring at the busway level? For what objectives? Benefits?
*Serena DeVito*: Yes we do do power monitoring at the busway level and this is for a number of reasons. We need to monitor loading across the phases in order to watch what happens when we add systems. We also monitor the load on the busway as a way to see how the space is being utilized, and also for determining PUE for the room.
*Q*: On slide 21, you depict the PUE of 1.28. One of the savings was more than doubling the efficiency of the UPS/Transformer. How did you do that? |