TIA-942: Data Center, Standards Overview describes the data center infrastructure requirements. The easiest is Tier1 data center, he is basically a computer room, a basic computer system installation guide. The majority of the urgent needs of the the Tier4 data center is designed for the task of evaluation of the host is a computer system, such system to be fully redundant and is divided into security zones, this security zone by biological measurements to control access. Another consideration is the layout of the underground content of the data center to data security as well as to environmental considerations, such as cooling demand.

The prosperity of the data center the advent of the dot-com bubble. Companies need a fast Internet connection, and continue the deployment of the system and the emergence of the Internet. Installation of such equipment is not feasible for many small companies. Many companies started to build a very large device, known as Internet data centers (IDCs), it provides a system deployment and operation of commercial solutions. New technologies and practices are designed to handle the operational requirements for the measurement and such a huge measurement operation.
Since 2007, data center design, build and operate a well-known subjects. The standard document from a trusted group of experts, such as the Telecommunications Industry Association, detailing the needs of data center design. The well-known operation of data center availability metrics can be used to assess the impact of business interruption. There are many developers be done in the operating practice, and design a friendly environment for the data center.
The IT business is one of the most critical aspects of the majority of the organization's business. A major concern is business continuity; companies rely on their information systems to operate their business. If a system becomes unavailable, company operations may be impaired or stopped completely. IT operations to ensure a reliable basis for construction organizations, the destruction could be minimized, it is necessary. Information security is a concern, and for this reason, a data center had to provide a safe environment in order to ensure minimize the possibility of a security breach. A data center to the integrity and functionality of its host environment, and must therefore maintain a high standard. This double redundant fiber optic cable and contains emergency backup power sources to be completed.

Data center in the great room of the early computing industry is the root. Early computer systems operation and maintenance of complex, requires a special environment to operate. Need a lot of cables to connect all the components, and thus the supply and organization, such as the standard bracket to position equipment, improved flooring, as well as cable plate (installed overhead or elevated floor). Similarly, the old computer requires a lot of power, had to be cooled to prevent overheating. The security is very important - the computer is very expensive, and often used for military purposes. The control computer room access to the basic design principle of design.
In the prosperity of the micro-computer industry, especially in the 1980s, computers began the development of four, in many cases little or no operational requirements. However, with the development of information technology (IT), the operation became complicated, gradually recognized the need to control IT resources. With the client - server computing, microcomputers in the 1990s (known as servers) began to find their place in the old computer room. The availability of inexpensive networking equipment, plus a new standard for network cable, making a room within the company, the use of hierarchical design to place the server this may be recognized at this moment, and continue to catch on.

IDC originated in the demand for high-speed interconnection of the network in ICP, and the United States is still in the position of world leader. Operators in the United States, in order to safeguard their own interests, to network interconnection bandwidth is set very low, the user had in each service provider to put a server. To solve this problem, IDC came into being to ensure that the customer managed server from the network access speed bottleneck.
IDC is not only a center of data storage, and the flow of data center, it should be the most concentrated areas of data exchange in the Internet network. It is accompanied by hosting and virtual hosting services, higher demands on the conditions, in a sense, it is evolved by the ISP's server hosting room. Specifically, with the rapid development of Internet, Web site maintenance growing system bandwidth, management requirements constitutes a serious challenge for many enterprises. Thus, all things related to web hosting services to the IDC specializes in providing network services to do, but will focus on strengthen the core competitiveness of business. Visible, the IDC is a more refined product of the Internet Enterprise Division.

Internet Data Center IDC is based on the INTERNET network, the base of operation and maintenance of facilities and provide related services to provide for centralized collection, storage, processing and sending data equipment. IDC's principal activities include hosting (seats, racks, VIP room rental), resource rent (such as virtual hosting business, data storage service) (the system configuration, system maintenance, data backup, troubleshooting, service), management services (such as bandwidth management, traffic analysis, load balancing, intrusion detection, vulnerability diagnosis), and other support to run the service.
IDC concept of a unified standard, but the concept can be understood as the public business of the Internet computer room, it is also an IT professional services, is the critical infrastructure of the IT industry. IDC is not only a service concept and the concept of a network, which constitutes part of the network infrastructure resources, like the backbone network, access network, provides a high-end data transmission (DataDelivery) services and high-speed access services .

Business or personal use of the virtual host site in someone else's server, sometimes like a foster child in someone else's home, although there are food and drink, to worry about or inevitable. Should fully understand the mood of the user as a virtual hosting provider, while providing timely emergency response and related technology solutions and services should be based on a solid technical foundation and extraordinary sense of responsibility to do the construction and maintenance of the virtual host site, as well as related value-added services. Fact, to provide virtual hosting service is a very high technical threshold, according to industry insiders, web hosting services provider must control a variety of operating systems and operating system management, optimization, and have the system in these operating systems level and application-level R & D capabilities (such as a variety of web servers, mail servers, DNS servers, load balancing, etc.) must also have a WAN, LAN and other network management capabilities (for example, understand the principle of routing and switching), as well as the management of computer hardware level configuration database processing capacity. If the web hosting service provider does not have a professional technical team to provide technical support as described above, the virtual hosting service providers not only can only provide poor service, but stability of the services have no way to ensure that.

The virtual host technology makes possible, the virtual host does reduce the corporate Internet station construction costs to create multiple sites on one physical server, but everything has a limit. According to experience, when a virtual host site is about more than a certain number (200), server performance will be significantly decreased if some of these sites also provide a database query services, and server performance degradation is more severe some of the world's leading webhost and even the number of users on each server is forcibly limited to less than 100. More service providers in order to attract customers, dare a few dozen virtual hosts marked as hundreds of people at the same time online, what is more able to say limit any resources. Such a commitment, we can imagine, a single physical server can support up to while online 2000-3000 concurrent to a common server costs about 10,000 yuan / year, think about it, service providers in order to earn back the cost to put the number of such sites running on the server, this server can be used?

Virtual host as a network service, the most important is the stability of the system. Stability around the line rate of the virtual host is directly related to the Q virtual mainframe technology architecture question whether the site can be accessed. The virtual host performance is good or bad depends on the configuration of the server and operating system of software in addition to a certain extent, the room in which the external environment. Bandwidth is a guarantee of speed, the speed of the server, depending on the bandwidth. Bandwidth refers to the virtual host to connect to each server bandwidth, many service providers often only publicity in promoting the bandwidth values ​​that connect into the engine room, but did not specify the available bandwidth of each server. As consumers should be extra careful. As external factors affecting the stability of the server, the engine room temperature, humidity, artificial control is particularly important, which the management and services business opportunities room maintenance cost input related. Large service providers within the engine room temperature, humidity, and artificial control is extremely strict, which reduces the rate of server instability. So in general the so-called brand host the price is relatively high, this part of the price is the host commercial to maintain the engine room, it is also reasonable.

(1) certain capabilities may be the limitations of the service providers, for example, may consume system resources forum, traffic statistics, etc.;
(2) website design needs to consider the function of support service providers, such as database type, operating system;
(3) certain virtual host site access speed is too slow, which may be caused as a result of hosting providers will be a host rented to a large number of websites, or the server configuration and other reasons the site of this situation can not be solved for normal access to the site will have adverse effects;
(4) Some service providers on traffic restrictions, so that when the site traffic will not be able to normal access.
Site is a virtual host or a dedicated server, according to the situation and anticipated developments of the site to consider.
(5) virtual host in order to reduce costs are not independent ip address, ip address can not directly access the site (because the same ip address multiple sites)

Virtual hosts on a network server, carved out a certain amount of disk space for the user to place the site, application components, etc., to provide the necessary site features, data storage and transfer capabilities. The so-called virtual host, also known as the "web space", a computer running the server on the Internet is divided into multiple "virtual" servers, each virtual host has a separate domain name and complete Internet server (to support the WWW, FTP, E-mail) feature. The virtual host is the Gospel of network development, to promote the application and popularization of network technology. Rental services of the virtual host has become a new economic form of the Internet age. The rental of the virtual host is similar to the housing rented.