Shulou(Shulou.com)06/02 Report--

The concept of IT is information technology, in which "I" represents information (or data), "T" represents technology (or computing), and technology is used to process information, so I is the end, T is the means, and T is for I. The security associated with T is mainly "computational availability", and if people cannot handle I because of T, then this situation is called computational unavailability.

Unavailable computing will cause people to be unable to process all or part of the data, while power outages, network outages, software / hardware failures, lack of application software, forgetting accounts or passwords, etc., will cause all or part of the computing to be unavailable. Compared with traditional IT systems, cloud computing does add a possible failure link-the cloud, and once the cloud crashes, the impact will be very wide, but it can not be completely denied cloud computing, because there is no such thing as perfect.

Decision makers and cloud computing engineers will weigh the importance and cost of computing to build a cloud that is satisfactory to all parties. For example, a national public cloud that concerns everyone's interests will consider setting up a disaster preparedness cloud in different cities and a data backup center in another country; a public cloud involving the whole province may consider setting up a data backup center in cities in other provinces; a private cloud of Fortune 500 enterprises may establish a remote disaster preparedness cloud The private cloud of a medium-sized enterprise may introduce clustering, fault tolerance and failover technology; even the private office cloud of a small company with only a dozen people will adopt dual fault tolerance technology. the office will be affected only when two servers fail at the same time, but the probability of simultaneous failure is almost negligible, unless there is an uncontrollable event such as a power outage or an earthquake.

IT system also follows the development process of "manual → stand-alone → private cloud → public cloud", and the benefits of each evolution far outweigh the disadvantages. Even for enterprises that do not use cloud computing, there are many "single points of failure" in their IT systems-a problem will affect the business management of the whole enterprise. For example, the enterprise mail system, portal site, ERP system, file server, local area network access authentication system and so on, that is, the S-side (server side) of Chand S or Bamp S is a single point of failure. The main causes of unavailability of computing are power outage, network outage, hardware failure, software failure (including virus infection).

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In the traditional IT system, the probability of computing unavailable caused by software and hardware failures of personal computers is close to 95%, of which software failures are the most common, while the probability of unavailable computing caused by power outages and network outages is very small, and the probability of unavailable computing caused by server failures is less than 5%. When an enterprise adopts cloud computing, the cloud terminal is a pure hardware, low-power product, and the CPU and memory are welded on the motherboard, and there is no hard disk, so the probability of cloud terminal failure is almost negligible. The cloud adopts multi-channel power supply, constant temperature and humidity system, and introduces cluster technology, fault tolerance technology and load balancing technology to ensure the continuous availability of computing, so that the cloud computing system composed of cloud, network and terminals has high reliability and security, and the computing availability is very high.

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