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Datacenter migration，there are different challenges in the application and structure of different types of data centers, and the data center architectures chosen are different. The difference in choosing these standards is determined according to the development scale of the data center, the increasing business needs and user requirements.

Different data center architectures currently support a specific business model of three data center architectures, corresponding to their own business goals, which are three completely different data center architectures: the enterprise data center managed data center or the IaaS portal or the Web 2 data center when there are other factors that lead to the data center Different, these factors include: traffic is mainly in the data center (east-west), or is the main guide to the customer (North and South), or the second or third layers of the traffic management in the integrated processor and the rack, how much of the total number of servers in the use of storage technology is virtualized. The selection of data center architecture will select different data center architectures on the basis of different needs and in selecting network technologies and devices. For example, enterprise data centers usually assume great computing power. A small enterprise can build a data center with around 200 servers, and the data center of large enterprises often has more than 1000 servers. In particular, a number of vertical industries, such as oil and gas exploration, biotechnology and weather forecasting, often need high performance cluster computing (HPCC) to face their huge analysis and calculation needs. At the same time, these data centers are also directly faced with customer service requirements, in which traffic needs to stay within the data center and also need to be directed to the customer.
Virtualization and integration of network server virtualization technology and fusion network are two main trends of data center development. These two technologies enable the data center to make more efficient use of resources. Now most of the enterprise data centers integrate traditional L2 and L3 network services, and combine virtualization servers with physical servers.
Portals or Web2.0 are usually services for the public, such as search, games or social networking sites. Their data centers have a very special need. As the world's largest data center dedicated to specific applications, it faces a large number of users who use the application. In these data centers, the first thing is to ensure that users can access applications and provide the fastest speed. Therefore, virtualization technology can not be applied in large scale in these data centers.
The virtualization development of managed data centers, managed data centers usually face dozens of small and medium-sized enterprises all over the world. Unlike the data centers of portal websites, the establishment of these data centers is independent of specific applications. The traffic provided by these data centers (IaaS) usually stays inside the data center without guiding users. Therefore, in these data centers, virtualization technology can be widely used, and some complex operations can be handled through virtual machines. Virtual machines replace physical hosts in large numbers, thus saving costs.
Therefore, different data centers need different specific environments because of their different network functions and different data center architectures.
Virtualization is a very important technology for virtualization of network requirements, because it improves the utilization of server resources. But on the other hand, it also makes the operation and management of the network more complex. Within a managed data center, it is largely dependent on virtualization technology, which indirectly promotes the development of virtualization in the direction of simpler and easier management. And the development of virtual technology, in addition to the efforts of the switch vendors, such as the establishment of EVB (edge virtual bridging) standards, server virtualization requirements for the network also become more and more important as time goes on. The rapid development of server virtualization in data centers has also accelerated the development of the 2 layer network topology technology, including ToR and Core level. This simplified 2 tier network architecture can better adapt to the development of virtualization technology, reduce costs and improve the mobility of virtual machine when the network is running normally. Other 2 tier network related standards, including TRILL (transparent link interconnection) and VPLS (virtual private LAN service) have also been developed.
As the most widely used and the most professional data center architecture in the world, the data center of portal website is the main driving force to improve its network performance. In order to improve the efficiency of data center, increasing bandwidth and increasing density is a traditional practice. Inside the data center, the portal website needs a completely non blocking internal network. Outside the data center, the portal website needs the lowest delay from the terminal to the server. In this case, the 2 layer network topology can provide enough buffering capacity to handle the burst traffic peak. In addition, the portal has promoted the development of high-density data centers and the application of 40/100G Ethernet standard.
This shows that a fixed data center architecture is not suitable for all data centers. When designing a data center, there is a clear understanding of the tasks and important requirements of the data center, and the network designer can also optimize the peak performance design of the data center.