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Power distribution system, Power supply to data center is as important as the heart to human, without the Power of the continuous Power supply data center will not be able to operate.When the equipment in the data center has automatic power failure, shutdown, power failure and other related adverse phenomena, it is called the power failure.The loss of power to the data center will be very serious, and the data center may stop running, and all applications will not be able to continue.For example, in June, 2016, the equipment room of dalian telecom hub was suddenly broken due to a municipal power failure, which caused part of the circuit to short-circuit, and the damage of the transformer caused the trip, which resulted in the failure of the core equipment.The loss of power caused the mobile phone call and SMS of mobile network users in dalian city and lushun area, which could not be used normally.In November 2015, shanxi securities lost power due to the power of the data center, and the trading system of the stock market was interrupted, which caused many shareholders to be unable to conduct transactions, and the losses were serious.In October, 2012, the fifth anniversary of vancl, the machine room dropped the power and caused the visit of vancl. The website had no transaction for a long time, and lost a lot of income.In November 2011, one of the operators in tanggu, tianjin, lost power, resulting in a number of services such as roaming, pea pods, sina mailbox and so on.There are a number of examples of the number of business interruptions caused by the loss of power in such data centers.No one wants a data center electricity, power has become the data center a menace, because they don't know what time you'll find out electricity, would occur in which devices, power lost before without any warning, the data center, for the problem of power lost hand does.The loss of electricity has become a pain that the data center can't erase.

The loss of power not only causes losses in the running business, but also has many other negative effects.First of all, the loss of power is very harmful to the electronic equipment. When the equipment is running, suddenly the input is not supplied, and all the capacitor parts in the equipment are discharged.Power if it is completely ok, if it's frequent fluctuation of electricity, or power supply bad quality fluctuate, this kind of situation is the most likely to cause equipment within the capacitance properties of device failure, reduce the service life of equipment;Second power for electronic devices for internal use of memory storage devices, memory device is in the process of reading and writing, suddenly lose power, memory particles electric up and down repeatedly, quality bad memory chips are prone to damage, leading to the call, the device initialization had not to normal boot, equipment failure;The third drop can cause the application software system to run abnormal.For example: the damage to the LINUX system server.The LINUX file system contains EXT3, REISERFS, JFS, and other journaling functions, and these log file systems are overwhelmed by the loss of power.Commonly used EXT3 and REISERFS file system, when encountering sudden power drop, when the system is turned on again, it often happens that there is no self-lifting fault, and manual FSCK is required.
And also have damage to the ORACLE database, power leads to the ORACLE part of the control file, REDOLOG bad, bad Rollback Segment bad, data files, etc., when the power supply again, ORACLE database can't start properly, abnormal operation.Root cause of the abnormal application system is in the case of power lost, the application software of the data is not timely backup, if in the fall, after the occurrence of electric equipment can work for a few minutes later, keep the important data is complete, we would not happen this kind of failure.The fourth power outage is only one reason for the power failure. Many times it is not because there is no power supply, but the meaning of power loss is much wider.For example, the equipment failure caused the short circuit of the power supply line, resulting in a large electric current, which broke the switch of the fuse box, causing the power supply equipment to fall off.The power supply is protected by overpressure and overtemperature, and the power supply automatically enters the protection and no longer works. This will also cause the device to lose power.Sometimes, some important voltage on the device does not produce the power loss caused by the undervoltage protection, which is usually expressed as the power failure, and the voltage can not be measured with a multimeter.In short, the impact of the power drop on the data center and its equipment is multidimensional, and some precautions should be taken to avoid frequent power failure in the data center.
Most of the time, the data center is caused by human operation.Sometimes, when the power construction was carried out, the power cable was broken and the power was dropped.Sometimes in the adjustment of the equipment supply line, careless mistake leads to the fault or short circuit, which leads to the power loss of some devices. This kind of man-made failure is not uncommon, and the lesson is profound.Therefore, the primary task of the data center is to manage people, formulate strict and detailed operating rules, and avoid low-level human power failure.Data centers have redundant power supply, according to their own financial situation, on different levels of equipment power supply redundancy power supply, because only in all the way to power a data center all the equipment, electric, one thousand mains failure, the entire data center will be shut down.
So it's best to introduce two different grid, and the core equipment to have UPS, battery or backup power supply, so that when mains failure, really with backup power can guarantee the data center also continue to run for several hours, such as the utility to restore power, cut power supply input device to the mains, again to periodically check the backup power supply system of surplus capacity, backup power supply is on standby at ordinary times, and to use, it is important to ensure that power supply capacity, can't at a critical moment off the chain;It is necessary to evaluate the power supply safety of the data center periodically and verify the safety and reliability of power supply in a comprehensive way, and find out the problems that cannot be found in daily maintenance.Develop power supply emergency plan at the same time, clear off electricity failure process, operators, and vendor support requirements of the process, in the actual response to lose power, it can be done "food in the hand, do not panic in the heart".To maintain a good temperature and humidity environment in the data center, and avoid the electro static, corrosion, overpressure, overcurrent and other failures of electronic equipment, all of these can cause the equipment to fail.Although we do not know off electricity when faults occur, but we can do some protection work ahead of time, to avoid electrical, one thousand occurred off the electricity, also have complete emergency plan, ensure the data center business is not affected by power lost.
The loss of electricity is a pain that the data center can't erase. It has brought many painful lessons to the data center.After the above explanation, it can be seen that the power failure is terrible, but it can greatly reduce the frequency of power generation by developing some protection schemes.Even if it happens, there are redundant power systems deployed in advance to avoid damage to the data center business.