Virtualization in the data center of cloud computing

With the increasingly extensive use of X86 architecture Server, virtualization technology based on X86 Architecture server has started to guide the process of virtualization transformation of Universal Server. VMWare, XEN, Microsoft and other manufacturers at the software system level began to lead the trend of server virtualization. Previously, there were two main reasons for the slow progress of virtualization technology in the x86 architecture: The x86 architecture itself was not suitable for virtualization, and the other reason was that the x86 processor was not performing enough. The basic limitations of virtualization are addressed as Intel and AMD continue to modify the X86 architecture, and the X86 processor is rapidly improving in performance.

The direct effect of server virtualization is that the data center has a higher application density, and the number of logical servers (virtual machines) is significantly higher in the same physical space than the physical servers. As a result, the total business processing volume of the server increases, which increases the throughput of the server.

Virtualization computing technology has gradually become the main support of cloud computing services, especially in computing capacity leasing, scheduling of cloud computing services in the field plays a key role.

In the large-scale computing resource centralized cloud computing data center, the different server resources based on the X86 architecture, through the virtualization technology unifies the entire data center computing resources, and forms the computation resource pool which can allocate according to a certain granularity, as shown in the following figure. After the virtualization of the resource pool masks the differences of various physical servers, forming a unified, cloud internal standardized logical CPU, logical memory, logical storage space, logical network interface, any user of the use of virtualization resources in the scheduling, supply, measurement are consistent.

Virtualization technology Not only eliminates the diversity of large-scale heterogeneous servers, the resulting computing pool can have super computing power (as shown in the figure below), a cloud computing center physical server to tens of thousands of is a very normal scale. The number of virtual machines running on a single physical server is dynamically changing, currently typically 4 to 20, some high-density virtual machines can achieve a virtual ratio of 100:1 (that is, running 100 virtual machines on a physical server), increasing CPU performance (frequency elevation, multi-core multiplexing), and current hardware virtualization ( With the aid of CPU instruction level virtualization, memory virtualization, bridge virtualization and network card virtualization, the number of virtual machines running on physical servers will increase rapidly. Running hundreds of thousands of virtual machines in a large IDC is predictable, and the current cloud services IDC is already considering these factors when it comes to business planning.

(Responsible editor: The good of the Legacy)