What is virtualization technology and what is virtualization used for

By increasing the number of parallelism executed by threads. to emulate a multi-core CPU

Virtualization is a broad term that, in the context of computers, generally refers to computing elements operating on a virtual basis rather than a real one. Virtualization technology can expand the capacity of hardware and simplify the process of reconfiguring software. CPU virtualization technology can emulate multiple CPUs in parallel with a single CPU, allowing one platform to run multiple operating systems at the same time, and applications can run in independent spaces without affecting each other, thus significantly improving the efficiency of the computer.

It's just not technology in reality, you can't see it.

Virtualization is a logical representation of a resource that is not bound by physical constraints. The technology of abstracting resources from any one form into another is virtualization.

To sum it up:

1.Virtualization is a logical representation of a resource that is not tied to a physical resource.

2.The environment in which it runs is not on the real hardware, but a section of virtual memory on top of the hardware, or a virtual environment.

3.Virtualization provides a logical, rather than physical, view of data, computing power, storage resources, and more.

4.The development of virtualization has greatly reduced the cost of IT hardware, reduced the waste of resources, and improved the stability and security of the system.

The simple use of virtualization has two major benefits: 1. It saves resources and 2. It is safe and reliable.

1.In terms of saving resources, one computer can virtualize multiple server hosts to complement each other, such as our 23 now, several people are competing with each other for testing, development and testing.

2.Regarding security, if virtualization is used, each user uses their own virtual machine, allocates the resources formulated, and does not affect each other, even if you are poisoned, others do not affect, for example, server 23, the development of Xiaowan is used as a database, and Lina is used as a test, the test often needs to compare the environment, so maybe the test system will be repeated, install the software, so the time is very expensive, and if you get a virus, it will also affect the time of other people, if you use a virtualization server, Lina is like testing software, If you need to simulate three environments, you only need to replicate three virtual machines, even if one of them is poisoned, it will not affect the operation of others, and more importantly, it saves time. If you use virtualization on the Internet service, you can directly back up the virtual machine, and when it is poisoned, you can quickly migrate and restore it at will.

Hardware requirements, is as much memory as possible (memory is cheap), the processor must support virtualization technology, CPU generally I did not encounter a bottleneck, because under normal circumstances, the processor is not satisfied with the load load, but the CPU capacity does not wait for virtual 4 later, the average load is more than 50.

Virtualization prevents applications from sharing a single storage space directly with the system, which not only improves security, but also makes it easier to install and uninstall.

Virtualization is something that can be made, that is, things that cannot be seen in reality, which can be expressed through virtualization, no, it is something that can never be obtained from each other, and things that cannot be operated in reality can be operated with virtualized things, and they can operate what they want.

1.Less heat build-up.

For multi-million dollar data centers, cooling systems need to be designed, but the reality is that more and more servers are generating heat, and the cooling system of the data center is no longer able to handle more equipment.

By leveraging virtualization technology, you can increase the utilization of your data center servers, allowing you to score better server applications, so that the overall server hardware is better, and thus less heat is generated. This makes the problem of data center heat disappear. The reduction in heat also leads to a reduction in O&M costs.

2.Reduce costs.

The cost of hardware in a data center is very high, and by utilizing virtualization technology, you can reduce the amount of hardware you need, thereby reducing your costs. In addition to the amount of hardware, virtual machines can also make data centers easier to maintain and use less power, and the cost reduction brought by virtualization over time is very obvious.

Virtualization technology is completely different from multitasking and hyper-threading technology. Multitasking refers to the simultaneous parallel running of multiple programs in an operating system, while in virtualization technology, multiple operating systems can be run at the same time, and there are multiple programs running in each operating system, and each operating system runs on a virtual CPU or virtual host; The hyper-threading technology only simulates a single CPU and two CPUs to balance the performance of the program, and the two simulated CPUs cannot be separated, but can only work together.

The benefits that virtualization can offer depend on the customer's goals, the particular virtualization technology chosen, and the existing IT infrastructure. Not all customers will be able to reap the same benefits from implementing a particular virtualization solution. Now, even with simple server consolidation using virtualization, customers can often reap a lot of benefits in some way:

Higher resource utilization—Virtualization enables the dynamic sharing of physical resources and resource pools, improving resource utilization, especially for different workloads whose average demand is much lower than the need to provide dedicated resources.

nReduced management costs – Virtual can improve staff efficiency by: reducing the amount of physical resources that must be managed; Hide part of the complexity of physical resources; Streamlining public administration tasks by automating, gaining access to better information, and enabling management; Automate load management. In addition, virtual debates can support the use of public tools on multiple platforms.

nImprove flexibility – Virtualization enables dynamic resource deployment and reconfiguration to meet changing business needs.

nImproved security – Virtualization enables isolation and partitioning that cannot be achieved by simpler sharing mechanisms, and these features enable controllable and secure access to data and services.

nHigher availability – Virtual resources can be deleted, upgraded, or changed without affecting users.

Higher scalability – Depending on the product, resource partitioning and aggregation can support virtual resources that are much smaller or larger than individual physical resources, which means you can scale without changing the allocation of physical resources.

Interoperability and investment protection – Virtual resources provide compatibility with a wide range of interfaces and protocols that the underlying physical resources cannot provide.

nImproved Resources** – Virtual is able to allocate resources in smaller units than individual physical resource units.

Intel virtualization technology (IVT) is a virtualization technology developed by Intel, which can use IVT to virtualize a set of hardware devices for the guest operating system through a virtual machine monitor (VMM) on the system for use by the guest operating system. Historically, these leaky messaging techniques have been implemented in software on VMware and Virtual PCs, but the hardware support for IVT can accelerate the implementation of such software.