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Know More About Virtualization

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Manohar Parakh
Know More About Virtualization

What is Virtualization?

Virtualization in computing – the process of on-set of computing resources, or their logical association that provides any advantages over the original configuration. This new virtual view of resources is not limited to the implementation, geographic location or physical configuration of component parts. Perhaps it sounds too complicated for an untrained person, so try to be translated into “human language”.

Development of solutions based on virtualization, many vendors do, I would say – pretty much everything. After all, the logical drives, which are just partitions on a single physical hard drive – is also virtualization. SMP Technology, which allows programs to submit two or more physical processors as a single virtual – is also virtualization.

It is distinguishes between three aspects of virtualization: server virtualization, presentation virtualization and application virtualization. With virtualization concepts, they are more or less familiar to almost all system administrators: the most striking example of it – Terminal Services Microsoft Windows Cloud Hosting Servers. Application virtualization – the creation of a special, isolated environment within the operating system to run individual applications, the theme is very big and interesting, for a single long article. Here and below the word “virtualization,” we shall mean server virtualization. Windows Server 2008 adds built-in support for virtualization (hypervisor), called Hyper-V. In Windows Server 2008 R2 hypervisor was substantially modified, and became known as Hyper-V 2.0.

Let’s take a closer look at server virtualization. What is it? Speaking in plain language – is the creation of software-emulated environment, which imitates the hardware of the physical computer: CPU, RAM, hard disk, I / O devices. Further, on this virtual server can be running (to be called “guest», «Guest OS»), and some applications. All this will work as a full server, but it is not clear: it will exist virtually, inside the OS on a physical server (for this OS uses the term, Host OS). Moreover, within a single physical server can run simultaneously on two or more, and sometimes – even dozens of virtual servers.

For what it might be useful? Initially, the virtual machines are used only for testing purposes: to conduct experiments with them is much easier, quicker and most importantly – cheaper than a real server. I’m sure many sysadmin ever in my practice experience anything in a virtual machine. But now virtualization has become increasingly used in industrial applications. The fact there are substantial reasons, although as in every decision – have a place to be and disadvantages. About it – more.

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Manohar Parakh
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