What is virtualization?
In computer technology, virtualization is a resource management technology that takes various physical resources of a computer (CPU, memory, disk space, network adapters, etc.), abstracts them, transforms them, presents them and makes them available for partitioning and combining them into one or more computer configuration environments.
This breaks down the unbreakable barriers between physical structures and allows users to use these computer hardware resources in a better way than the original configuration. The new virtualized portion of these resources is not limited by the way the existing resources are racked, geographically or physically configured.
The general term virtualized resources includes computing power and data storage.
Since many companies in the information technology field currently advertise their technology as virtualization technology, these technologies can range from Java virtual machine technology to system management software, which makes it difficult to define virtualization technology accurately. This makes it difficult to precisely define virtualization technology. Therefore, various academic papers often refer to virtualization technology with a loose definition as mentioned above.
Why do we need virtualization?
1. Multiple versions of applications running on the same physical machine.
2. Low hardware dependency and easy data migration.
What's the advantage of virtualization?
1. Reduce operational costs
Server virtualization reduces the operating cost of IT infrastructure, freeing system administrators from the heavy workload of managing physical servers, OS, middleware and compatibility, reducing the frequency of manual intervention, and making management more powerful and convenient.
2. Improve application compatibility
The encapsulation and isolation provided by server virtualization allows a large number of applications to run independently in various environments, so managers do not need to frequently adjust applications according to the underlying environment, but only need to build an application version and release it to different types of platforms after virtualization.
3. Accelerate application deployment
With server virtualization technology, you only need to enter the activation configuration parameters, copy the virtual machine, start the virtual machine, and activate the virtual machine to complete the deployment, which greatly shortens the deployment time, eliminates manual intervention, and reduces the deployment cost.
4. Improve service availability
Users can easily backup virtual machines and restore backups after dynamic migration of virtual machines, or run backups on other physical machines, greatly improving service availability.
5.Improve resource utilization
The integration of server virtualization improves the utilization of CPU, memory, storage, network and other devices, while ensuring the availability of the original services so that their security and performance are not affected.
6. Dynamic scheduling of resources
In server virtualization technology, the data center is transformed from a traditional single server into a unified resource pool, and users can instantly adjust virtual machine resources, while data center hypervisors and data center administrators can flexibly allocate resources adjusted to virtual machines based on their internal resource usage.
7. Reduce energy consumption
By reducing the number of running physical servers, the power consumption of each unit other than CPU is reduced to achieve the purpose of energy saving and emission reduction.
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