Cabinet learning: data center cooling and environmental construction
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The effect of cooling the engine room, and cabinet selection and placement of the cabinet are closely related. For the cabinet can easily be ignored. Current liquid-cooled (or water) cabinet is the most discussed topic is the use of more accurate description of liquid unpopular cabinet.
High-density data center server deployment is inevitable, thus triggering the heat dissipation problem, should lead to a high degree of attention. This little cabinet, contains a huge mystery.
Next-generation data center is today's hot spots, whether it is resource integration, virtualization; or green energy, automation and security management, is the talk of the industry.
With the construction of a new generation of data centers, networks, servers, storage and other infrastructure to further concentration, which on the basis of the data center environment of the new requirements. A blade server application as an example, which has a high computational intensity, easy deployment, good management, green energy and other characteristics of the data center are a good choice. But for existing data centers, lack of electricity, cooling below standard, which are plagued the promotion and application of blade servers.
Address power shortage
We have previously introduced, the existing data center rack or cabinet, the power configured for 10A (amps), full load 15 ~ 16 can be deployed 1U rack servers. Some of the data center for the poor, and its power with the only 6.8A, for the purposes of blade servers. A fully configured blade server, power it needs about 10A.
Existing capacity in the data center computing, 10A power with apparently unable to meet more demand for the deployment of blade servers, the problem of insufficient power is very prominent. How to solve the problem of insufficient power supply, most likely think of is to start from the expansion. In fact, in data centers or buildings constructed at the beginning, there is a certain capacity for the power calculation. Today, the increasing power capacity, which requires the expansion of the electricity sector, and relate to the corresponding lines, switches and other equipment of the transformation, it involves many factors, subject to the control of many factors.
For existing electricity consumption to make reasonable adjustments, is to deal with power shortage in the other solution. According to HP's general manager of Global IT Services Division, introduced the Pan Chi, through the use of a set called "adaptive data availability management (Adaptive Data Availability Management, ADAM)" program tool, some of their existing enterprise data centers to monitor found that about 10% of electricity consumption for lighting, etc., but for the IT equipment power consumption is only about 30%, the rest a lot of power consumption in the refrigeration, that is, operation and management costs have greatly exceeded actual use of the equipment cost. Through a rational layout, and the thermal model of the scientific design, operation and maintenance of equipment can greatly reduce power consumption, effectively alleviate the problem of insufficient power. Starting from the cabinet
The high cost of air conditioning, and rack / cabinet and the design of the thermal model. It is understood that many air-conditioned room temperature is very low, summer, people in the room in need of clothes to wear very thick. The reason is the engine room equipment to the highest heat setting air temperature requirements, this extensive management, will inevitably lead to reduced energy efficiency.
The effect of cooling the engine room, and cabinet selection and placement of the cabinet are closely related. For the cabinet can easily be ignored. In an interview, an electrical equipment room manager, said corporate IT budget is limited, it is difficult to persuade business leaders to pay more than ten thousand yuan to buy the cabinet, in the eyes of some leaders, the cabinet room furniture and family life, and no much difference, you could save on the province. The pursuit of aesthetic style, a lot of glass door cabinets are used, resulting in ineffective cooling of machinery and equipment, the failure occurred frequently.
Current liquid-cooled (or water) cabinet is the most discussed topic is the use of more accurate description of liquid unpopular cabinet. The popular solution can provide better heat dissipation. According to Panduit product technical manager Wang Jianchun introduced, the ordinary air-cooled equipment can probably support 5kw (kW) of cooling demand, the use of liquid can be increased to popular 25kw ~ 35kw. In addition, as compared with air-cooled, liquid heat exchange easier to control and reduce the interference of hot air, more efficient.
Wang Jianchun, said the company's NetAccess cabinet to Vydyne example, the popular system uses a separate water circulation system, using cold water (Chill Water) as a refrigerant, a distributed compression host CDU (Cooling Distribution Unit) generally able to provide 120KW 150KW cooling capacity (the maximum individual products to provide 300KW), that a CDU to control up to six water unpopular cabinet, CDU and two each have their own water connection between the cabinet. CDU construction is not complicated, just pay attention to the bend to install leak-proof devices, requirements and strong electric power line to maintain a certain distance. Upset by this water system for local high-density server cooling problem provides a very effective solution.
Popular systems for liquid
Popular system for the liquid, Johnson & Johnson, manager of enterprise computing in China, said Meng-Wei, they will not use a similar system. Recently, Johnson & Johnson has just completed a large data center construction projects, by constructing 2 or 3 data centers in the Asia Pacific region for the Johnson & Johnson 14 countries and regions, production plants and sales offices to provide a full range of IT services, including services, including ERP. Through this centralized data center consolidation, IT Johnson & Johnson changed the previous way of deployed distributed enterprise management level has been further improved. According to Meng Wei, the process of building the data center, they use the Itanium server, also used in the blade server. One blade server application integration, green energy and so does have excellent performance. Problems related to heat, from the application of results, the heat capacity of the blade server itself has to meet the need. Unpopular with liquid cooling for the way they are very worried about the water leak.
Market Data Systems Ltd in gold and Meng-Wei Zhang Song managers held the same view. At present the data in the gold in Beijing, Shanghai, South China, Yantai four core nodes build a large-scale data centers and remote backup built in the western center. Relying on these data centers, the claims data for the financial and other large domestic enterprises to provide third-party data center outsourcing services in the domestic financial sector has a wide range of visibility. Zhang Song said the data center room of their building is completely dry environment, even if used in water-cooled air conditioning system, the water cycle of the part of all isolated in the engine room, the room environment, a drop of water at all. The aim is to ensure the absolute security of computer room environment.
Room service provider of professional system is also popular for water holding a wait and see attitude. Beijing Chong Xue won the British technology company, said thin, they recommend the program to the user when the water would not recommend less popular systems, one for most users the north, there is no need to use water-cooling system; Second, a lot of users for security consideration of acceptance for water and a popular acceptance of the process step by step. Technology from the perspective of a win, they will follow the water unpopular system technology, for tracking their development. British Snow said the thin, early in the promotion of new technologies, the price is always a lot of money, so now select the best air cooling system is cost-effective.
For fluid leaks caused by safety problems, Wang Jianchun that this concern stems from popular systems for water users lack the necessary understanding. Water, for example, it has been a special treatment, is insulated, non-conductive. In addition, you can monitor the system through a variety of monitoring and management system at any time, can do to prevent and police. Wang Jianchun said that the current computer room air conditioning systems in most cases, air-conditioned diffuse push, and in order to cool down the local high heat areas, often need to adjust the temperature so low, resulting in an average data center, PUE (Power Usage Effectiveness, efficiency of energy use) in 2.5 more than 1.7 or so in foreign countries, compared to the data center environment and facilities of domestic energy consumption has been greatly over IT equipment itself. Data show that, by using cold water (Chill Water) cooling system, at least 20% increase in energy use efficiency.
Air response
In order to control the local thermal heat zone, in addition to liquid unpopular in a systematic way, but by increasing the air-conditioning, cold air pressure for the local area is also a common way. Traditional market of professional cabinet manufacturers, such as KSTAR, totem, the Veyron so has the corresponding products and solutions. In the interview, KSTAR Wei Min Liu, product manager, said the system solution approach is a popular high-end applications, suitable for distribution in the blade server is full of environmental conditions, which often appear in the telecom operators and other data center room, But for most users, there is no such applications. Here, Liu Wei-min, referred to the costs, restrictions on the size of the current popular solution is still relatively high price of the system. Compared with air-cooled system solutions, the price difference at least an order of magnitude for the user, this is a relatively large investment.
By increasing the local air-conditioning, and a reasonable display cabinets, such as the cabinet door to door, back to back, so that alternating hot and cold air duct way, heat can also achieve good results. In this regard, Wang Jianchun that the local increase in air conditioning but there are some limitations, the first air conditioning system needs to take the necessary physical space, it requires additional air conditioning in a row, face to face for the local heat of the cooling region. In addition, approximately this way can increase the cooling capacity of 15kw. Over this range, air-cooled will do nothing.
