A load load than the amount of space, although the application of the virtual host multiple users sharing a stand-alone server, but users need to understand, in the end how many users share the same server resources to service providers. Because the only service provider to make a fair allocation of the share of resources between individual users can be assured that the actual interests of most users. If too many users sharing the server overload run, will inevitably reduce the stability of the server, reducing CPU processing capacity, difficulties in the program is running, allowing users to visit the Web site can not find the page can not be linked to the database, or even unable to access such serious failure. In general, the different types of services provided under the virtual host, few users of a server to share a few, should not be more than the limits of the hundreds of users. Some number of servers is not enough service providers to maximize the use of the hands of limited hardware resources, or even placed on a single server to thousands of users, the effect can be imagined. Therefore we want to have reasonable resources to protect the virtual service, you must pay attention to the strength of the service providers. If the service provider using the number of servers, the user load in the selected virtual hosting services "specific" commitments. It is best to choose the kind of large-scale multi-comparison web hosting service providers to do the partners. Second, the traffic flow is the number of user site may access, service providers the same principle of fair allocation of server resources, each user site traffic to be restricted, but the problem is that they limit the extent of If the limit value is too small it will greatly damage the interests of users, and can even think, if the flow value to a very small site storage space for useless, because it makes the user site browsing speed, especially slow. In general, as long as the services provided by a more adequate hardware resources would not be too restrictive to flow. And those who attempt to "full" use of limited hardware facilities can not provide a lot of traffic service providers, in order to be able to attract as many users as possible, it will take only add a hard drive without Additions server this sacrifice server stability consideration, the way the same type of hosting space capacity increase by tens of megabytes to flaunt its "large" advantage. Third, the number of links number of links that can accept applications in a flash and then open the web page access number, the size of the link value is directly related to virtual user on the host site login access level. If the link count limit too little, you can access the user site number is very limited user page will allow visitors to wait for too long, not normal circumstances, general indicators support the standard of the number of links will not The Xing limited. But some service providers can easily monitor user, forcing them to choose high price level virtual service type, but also rigid numerical division of the number of links, so need to pay special attention to the user to buy. Fourth, online rates take the construction site should always be to keep it running state to ensure that visitors can log on at any time. This was originally a matter of course requirements, foreign web hosting providers are generally user site uptime commitment. However, only a few service providers in the country a clear commitment to ensure line rate of the user site, the majority of service providers due to bandwidth, hardware capabilities and management capacity constraints, it is prone to downtime problems, it is not or is not willing to issue Open the "quantitative" guarantee. Five flexibility flexibility is whether the ISP can provide users with the economic, convenient service options. There are two points worthy of special attention to: first, whether the decision to increase the amount of web space capacity; another is the ability to use the same price to use a different operating system platforms. Because these two issues are directly related to the interests of users Once the user's site to the original amount of space close to saturation, the user must increase to configure the job. But the problem is that many service providers reap high benefits, generally does not allow users Shizhao twenty trillion increase a small amount of space, but only allows the increase in the standard of the Fast, disguised to force users to upgrade, which would allow users spend a lot of money to buy the wealthy resources of those who simply do not have access. Operating system could freely elect, and some users accustomed to using the unix platform, while others are good at website platform with windows nt, but some vendors based on the difference on such use of the same type of site service area is divided into price on the different grades. So before buying, but also to "shop around". The site features a lot of businesses just access to the Internet services provided by the site management interface is not so simple to use, the feature does not then complete, it is difficult to operate smoothly in the future use of the Site. So it should be noted, whether the ISP provides for the user of the website like the automatically generated page module, frontpage extensions, functions, and so can spare yourself the trouble to do complex operations.

First, the operating length of time the length of operating time is an important criterion of evaluation of a web hosting provider. Second, whether the room whether you have a reliable and stable, secure, high-speed engine room is another important criterion for the measure of a successful web hosting provider. Often this happens in the Internet industry: some companies do not have the engine room, not even the engine room, but they tend to price below market price promised to the user a variety of services. One can imagine, the lack of adequate hardware support, technical strength, these commitments often can only be impractical castles in the air. So be sure: even room locations are reluctant to tell customers the company must contain fraudulent web hosting provider, the majority of users to deal with such situations to maintain a high degree of vigilance. Three, lead to cost-effective low-cost high performance low-cost service providers to prevent the disappearance of excellent reputation, excellent quality, sincere service, the right price for a successful web hosting provider, not one less. Required to line the number of customer presentations address, and trial space, like the new sharing and other IDC service providers who offer a trial service. Fifth, do not be cheap to rent a certain customer base space to host. In general, the larger service providers due to its investment in hardware devices, network resources, security, human resources, business reputation, marketing, etc. are far more than ordinary service providers, so prices tend to be more high, However, the quality of service is more secure. , Service providers can best provide the mailbox, the FTP management capabilities. Seven, pay special attention to the fact that there are many swindlers home PC server, the ADSL access. The stability and speed of this space are very poor, remember to not be greedy little cheaper. Eight space virtual host space capacity is an important indicator in the assessment of the virtual host performance. Under normal circumstances, we must at the same time assessment following space size

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.