作为用户，你们中的一些人可能对现在几乎出现在每个技术站点的两个术语感到困惑：  云计算^{(Cloud Computing)}和虚拟化^{(Virtualization)}。我们已经介绍了有关云计算^{(Cloud Computing)}的介绍性文章，但这里没有介绍虚拟化。^{(Virtualization)}因此，让我们尝试了解什么是虚拟化^{(Virtualization)}以及它提供了什么，因此它已成为一个流行词。

什么是计算机中的虚拟化

首先^(First)，要了解虚拟化^{(Virtualization)}并不是什么新鲜事物——它一直存在，它在大型机计算机^{(Mainframe Computer)}时代非常重要，需要以有效的方式共享资源，因为当时它们的成本很高。

随着时间的推移，虚拟化^{(Virtualization)}失去了它的重要性，主要有两个原因：

1. ^(Hardware)LSI和VLSI的^(VLSI)硬件成本大幅下降。
2. x86 架构变得非常流行。

简而言之：

虚拟化是将服务器、数据库、网络、操作系统等资源划分为一个或多个不同执行环境的任何框架或过程或层。

它允许用户运行单个物理资源，例如您的服务器或存储设备，使其看起来像多个逻辑资源一样运行。虚拟化实际上所做的是抽象计算资源的特征，以便其他进程、应用程序或系统可以以非冲突方式与这些资源集进行交互。

示例可以是对驱动器进行分区、使用移动模拟器或使用 Virtual PC 或VMware桌面虚拟化产品等产品。

像云计算^{(Cloud Computing)}这样的虚拟化没有标准的行业定义，每个定义都可以是正确的。它也没有标准类型，因此我们可以将其分为三大类：

1. 操作系统虚拟化
2. 存储设备虚拟化
3. 应用虚拟化

还有一些其他类型的虚拟化经过多年发展，现在在云计算和网格计算等新兴领域越来越重要。它们是存储虚拟化、服务虚拟化、硬件虚拟化、网络虚拟化、管理虚拟化和应用服务器虚拟化。^{(These are storage virtualization, service virtualization, hardware virtualization, network virtualization, management virtualization, and application server virtualization.)}

阅读^(Read)：如何通过BIOS启用或禁用硬件虚拟化。^{(enable or disable Hardware virtualization)}

虚拟化的范围正在扩大，并且很快就会推出单一的片上架构，我预计在这个领域会有很多投资。

我将在以后的帖子中对上述类型进行阐述。

看看Windows 操作系统中的嵌套虚拟化。^{(Take a look at Nested Virtualization in Windows OS.)}

What is Virtualization technology?

As a user, some of you may be nonplυssed by thе two terminologies which appear now almost at every technical site:  Cloud Computing and Virtualization. We had covered introductory articles on Cloud Computing but Virtualization has not been cоvered here. So let’s try and understand what іs Virtualіzation and what it offers because of which it hаs beсome a buzz word.

What is Virtualization in computers

First of all, understand that Virtualization is nothing new – it was always there, it had great importance during Mainframe Computer time where it was required to share the resources in an efficient manner, as they were quite costly at that time.

With the advent of time Virtualization lost its importance due to two major reasons:

1. Hardware costs dropped down drastically with LSI and VLSI.
2. x86 architecture became very popular.

In short:

Virtualization is any framework or process or layer which divides the resources like servers, databases, networks, operating system into one or more different execution environments.

It allows users to run single physical resources like your server or storage device to appear that it is running as multiple logical resources. What virtualization actually does is that it abstracts the characteristics of the computing resources so that other processes, applications, or systems can interact with those sets of resources in a non-conflicting fashion.

Examples can be partitioning the drive, using the mobile emulator, or using products like Virtual PC or VMware desktop virtualization products.

Virtualization like Cloud Computing has no standard industry definition and each and every definition can be correct. It also doesn’t have standard types so we can classify it under three broad categories :

1. Operating System Virtualization
2. Storage Device Virtualization
3. Application Virtualization

There are some other types of virtualization that have evolved over the years and are now gaining importance in emerging fields like cloud computing and grid computing. These are storage virtualization, service virtualization, hardware virtualization, network virtualization, management virtualization, and application server virtualization.

Read: How to enable or disable Hardware virtualization vis BIOS.

The scope of virtualization is rising and with single on-chip architecture to be rolled out soon, I expect a lot of investments in this field.

I will be throwing light on the above-said types in my future posts.

Take a look at Nested Virtualization in Windows OS.

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