Data center upgrade case: China Civil Aviation Information Center

It is impossible to change the engine for the aircraft in flight. But this kind of thing, spread to China aviation Letter Http://www.aliyun.com/zixun/aggregation/34599.html "> Deputy General Manager Ronggang head."

Ronggang Of course is not the replacement of the engine, what he has to do is to use the data center for nearly 10 years of four KVA ups to replace, replaced by 4 new 250KVA ups. It doesn't look complicated, but Ronggang know: the existing data center of China Airlines is responsible for domestic civil aviation in the world's 149 airports, as well as nearly 100 foreign offices, once a mistake, from New York to Moscow, from France to South Africa, the domestic civil aviation all the electronic ticket, boarding system will be all paralyzed, All ticketing business will not be able to work, the consequences will be disastrous.

Since faced with such a large risk, then do not replace the line? The answer is No. As a result, the existing UPS system has been running for 10 consecutive years, reliability and stability can not meet the demand, continue to use the same face a huge security risks; Secondly, the current civil aviation passenger's scale has exceeded 200 million people/year, and still in the annual rate of about 13%, This means that more information systems need to be supported. At the same time, with the rapid growth of the cost of operation and maintenance, the annual electricity expenditure of China Airlines is a huge expense. It is also a serious task for China to reduce operational cost through transformation, and the UPS system with higher power conversion efficiency is a very effective method. In addition, auxiliary to data center room refrigeration link improvement.

In this case, there is only one way out: replace the UPS online. Do not stop online, strictly command.

As the aircraft in flight to replace the engine, the online replacement of UPS also faces huge technical difficulties. In this respect, Yu Jin, deputy general manager of China Aviation Information Infrastructure Protection Department, who undertakes the task, points out that the difficulty lies in not directly using mains power for information system. He said that while the quality of power supply in the grid continues to improve, the waveform, frequency, voltage, jitter and other aspects still can not meet the needs of the back-end trading system, at any time may lead to equipment downtime. Moreover, during UPS delivery, mains power is not available. Once a user unit has occurred, UPS delivery during the power pulse caused by the system paralysis. In addition, the upgrade also faces a site problem, only to remove the old UPS system, can make room to install new ups.

Based on this, China Airlines employs the HP data Center service team, which has rich experience in data center implementation, to share the online upgrade business of UPS system. HP and China Aviation Letter team work together to develop the final implementation plan. According to Yu Jin, first with a temporary ups for the delivery of the old ups, the demolition of the old ups, after the new UPS installation, and then from the temporary UPS delivery to the new UPS. During the period, in order to ensure smooth and smooth delivery of two times, the implementation team developed a wealth of contingency plans. For example, in the delivery period using the building-owned diesel generator power supply, to this end, the technical personnel before and after the diesel generator, each line, each switch has carried out detailed pressure test, the test value reached 1.5 times times the calculation load. The technicians tested the frequency, voltage, waveform and so on of the diesel generator working in the stable section, as well as with the current mains, to ensure the foolproof.

In the choice of the timing of the system switching, the implementation team and China Aviation Letter related business unit has been fully communicated. Ronggang points out that system change is not a matter for the information center, it needs to work closely with the business unit. To this end, the centre leaders convened a number of meetings, consultations with various departments to deploy, assessment of possible accidents, consequences, and the development of emergency deployment. Take the switching time as an example, we need to select the time window of the smallest business volume, and strive to minimize the impact. According to Yu Jin, in the switch day, the implementation of the technical staff of about 30 people. But in each business unit, there is a large number of human security, at any time to deal with possible accidents, accumulated up to more than 140 people. The new switching scheme is only 404 steps, and can be said to be prepared very carefully. "When I see such a detailed plan, I know it will succeed." "Ronggang said.

At the same time, the UPS online replacement, the China Air Mail also has a refrigeration transformation of the data center. It is understood that before the transformation, compared with most of the domestic data center, China's data center of the refrigeration program is also relatively advanced, has adopted the cooling scheme of the lower air supply. If measured with the Pue metric (the lower the better), most data center data are 2.5~2.7, and before the transformation, the Air China letter reached 2.2. But China's air mail is not satisfied. With HP's cooperation, the use of sensors for each cabinet high, medium and low three locations for sampling, will be measured to temperature, air volume, to the advanced CFD simulation Airflow software processing, drawing the whole room heat dissipation model. "Based on this model, we can clearly know: where there is a short circuit?" Where is there a hot spot? Accordingly, we can adjust the opening of the ground, or by increasing the blind plate, to improve the efficiency of refrigeration. "Yu Jin said. Through this refrigeration transformation, China Airlines successfully lowered the PUE from 2.2 to 2.0, which means that it can reduce energy consumption by 18.7% (which also includes the contribution of new UPS power conversion efficiency). "It can save a lot of money each year for China Air Mail," he said. "Ronggang said.

The upgrade of the data center infrastructure has been successful, showing that China's data center in the overall strategic plan, the Department of Unified Coordination, personnel quality, business technology, emergency management, resource security and so on have the domestic industry's leading level also has to the transportation industry, The ability of the financial and other industries to provide a full range of outsourced services. Through this transformation, the existing data center life can be extended, at least 2 years time. It has also won time to build a new data center for China's Air mail. It is revealed that the investment of 4 billion yuan and 3 billion yuan in the new data center and Disaster Preparedness Center, has been in intensive, which a large part of the funds will be used for network, servers and other hardware and software equipment purchase, data center construction will also be a very important content.