IDC: as the company name refers to the International Data Corporation (International Data Corporation), the world's leading IT, telecommunications industry, and consumer technology market consulting, consultants and activities of professional service providers. Market tracking data in the field of IT has become the industry standard. IDC in 1982, formally established in China branches, is the first to enter the Chinese market, the world's leading market research firm. IDC is of IDG (International Data Group) (International Data Group), a subsidiary. IDG is also the first US-owned venture capital firms to enter China, we often see Shong from IDG China.

Internet data center (Internet Data Center) referred to the IDC. The telecommunications sector is the use of existing Internet communication line bandwidth resources, the establishment of standardized telecommunications professional class room environment, server hosting, leased, as well as related value-added aspects of the full range of services to businesses, governments. That is, the server into the data center server company, is what we usually call the server rental and hosting and other business. IDC server hosting business through the use of telecommunications enterprises or government agencies no longer need to build their own dedicated computer room, the laying of expensive communication lines, and need not hired network engineer, you can solve many of the professional requirements of their use of the Internet. The main application areas of IDC hosting website, web hosting and e-commerce. Such as websites, units managed host to the Internet static IP address allocation from the telecommunications sector, you can publish your own www site, their products or services through the Internet widely publicized; virtual host units through the managed host to host their own massive hard drive space rental, and for other customers to provide virtual hosting services, become ICP ISP; e-commerce refers to the units through a managed host, to establish their own e-commerce system, a commercial platform for suppliers, wholesalers resellers and end users to provide better service. IDC, namely the Internet data center. It is accompanied by the development needs of the Internet is rapidly developed and become indispensable in the new century, China's Internet industry. Internet content provider (ICP), business, media and various websites to provide large-scale, high-quality, safe and reliable specialized server hosting, space rental, wholesale network bandwidth, as well as ASP, EC business. IDC (Internet data center) is not an authoritative definition, but it has a deeper connotation than the traditional data center, it is along with the Internet evolving needs developed by ICP, corporate, media and The class Web site to provide large-scale, high-quality, safe and reliable specialized server hosting, space rental, wholesale network bandwidth, and ASP, EC business. The data center had been in the mainframe era, was to provide mainframe hosting, outsourced or centralized management and maintenance in order to achieve the professional management and reduce operating costs the purpose. IDC is settled (Hosting) enterprises, tenants or server group hosted sites; various modes of e-commerce on which the safe operation of infrastructure, and support the enterprise and its business alliance with its distributors, suppliers, customers such as the implementation of value chain management platform. IDC there are two very important features: the position in the network and the network bandwidth capacity, which constitutes part of the network infrastructure resources, like the backbone network, access network, which provides a high-end data transfer ( Data Delivery) service, providing high-speed access services.

IDC can provide users with the following specific services. Server load balancing: With the increase of site content, increased functionality, making the number of the site's server support began to increase the site's server load balancing services can be based on the actual server response traffic load between all servers in the server group in the time balance, to improve site performance and responsiveness, while reducing the occurrence of errors. Website Acceleration Services: Site Accelerator service allows the server to handle condoms Socket Layer (SSL) encryption / decryption work efficiency to increase the number of times to hundreds of times, thereby improving the response speed of the site secure transactions. With this service, the site can maximize the use of Internet server investment, under the premise that without sacrificing the speed of website access, to ensure the security of e-commerce transactions. With forward with extraordinary speed, the Chinese Internet is also growing demand for business users on the IDC, with the business transformation of telecom operators, a variety of data services is also emerging, such as China Telecom the megaupload plans to carry out the implementation of China IDC business systems such as mobile has also been a growing number of authorized users, have also been more and more attention as its main business platform IDC, security is one of the focuses. Today, not only domestic IDC business growth rapidly in the booming international IDC's Enterprise, with China's accession to the WTO, China's foreign trade growing number of overseas IDC demand is growing, the internationalization of IDC's Enterprise enables customers to find the right overseas resources. to conduct trade, which greatly promoted the development process of China's foreign trade!

The main purpose of a data center is to run the application to handle the business and operation of the organization's data. This system is internally developed by the organization, or from an enterprise software provider, where to buy. ERP and CRM systems like general purpose applications. A data center may only be concerned about the operating system structure, or provide other services. Often these applications from multiple hosts, each host is running a single component. Usually this component is a database, file servers, application servers, middleware, and other sorts of things. The data centers are often used for non-site backup. The company may be scheduled for the services provided by the data center. This is often the backup tapes. Be able to backup server local on tape, tape storage areas vulnerable to security threats of fire and flood. Larger companies may send their backups to the workplace. Back to cast the data center can be completed. Encrypted backups can be sent over the Internet to another data center, security saved. Disaster recovery, a large variety of hardware vendors to develop a mobile device solutions can be installed and operational in a short period of time. Suppliers such as Cisco Systems, Sun Microsystems, IBM, and HP-developed system can be used for this purpose.

Communication in the data center today is often based on the network running the IP control group. The data center contains a series of routers and switches to route traffic between the server from the outside world. Redundant Internet connection, often by two or more service providers to provide (see multihoming). Some of the data center server for internal users need to run the basic organization of the Internet and corporate network services, such as e-mail server, proxy server, and DNS server. Network security elements are also often be configured: for example, firewalls, VPN gateways, intrusion detection systems. Network and applications monitoring system. Additional non-workplace monitoring system is also very typical to prevent the data center internal communication failure.

Virtual host is using special software and hardware technology, a real physical host computer to split into multiple logical storage unit, each unit there is no physical entity, but each logical storage unit can be the same as the real physical host on the network, with the single domain name, IP address (or a shared IP address) as well as a complete Internet server functions.
The key technology of the virtual host, even in the same hardware, with an operating system running a different server for multiple users to open the program, without disturbing each other. And individual users have as part of system resources (IP address, the document storage space, memory, CPU time). Completely independent of the virtual host, exactly the same as the outside, the performance of each virtual host and a single host. So this was the logical host of the virtualization is called a "virtual host".
The emergence of the virtual host, Internet technology is a major contribution to the gospel of the majority of Internet users. Multiple virtual hosts to share the resources of a real host, each user to bear the cost of hardware and network maintenance costs, the cost of communication lines are significantly reduced, the Internet has truly become affordable for everyone to network. Now, almost all U.S. companies (including some families) are on the network set up your own WEB server, including a considerable part is used in a virtual host.
Different virtual hosts on a single server is independent, self-management by the user. A server host can only support a certain number of virtual hosts, when more than this number, the user will feel a sharp decline in performance.
Virtual mainframe technology used by the Internet server technology to save the cost of server hardware, virtual mainframe technology is mainly used in the HTTP service, a server, one or all of the services logic is divided into a number of service units, the external performance of multiple servers, in order to take full advantage of the server hardware resources. If the classification is a system level, is called the virtual server.
Virtual host technically Union hundred million units of computer, computer regardless of what model the operating system to run, what software to use, can be attributed to two main categories: client and server.
The client machine to access the information of others. Through the post office or other ISP dial-up, the computer was temporarily assigned an IP address, to take advantage of this temporary ID card, access to information in the ocean of the Internet, the network after disconnecting the computer from the Internet, the IP address was recovered.
Server is to provide information for others to access the machine, usually referred to as the host. People at any time have access to it, so the host must at all times connected to the Internet has its own permanent IP address. Not only to set up a dedicated computer hardware, but also hire expensive dedicated data lines, plus various maintenance costs such as rent, labor, electricity, etc., is not good to bear. To this end, developed a virtual mainframe technology.