what is virtualization?

"Virtualization is a technique which uses hypervisor technology to virtualize operating systems, network resources, servers and storage devices in order to save wastage of resources."

It is a technique which is used to create virtual environment to utilize resources like CPU, storage, network devices, server utilization etc. This technique uses hypervisor technology. Which enables a user to run two or more operating systems simultaneously. In OS virtualization OS kernel is compromised to create virtual environment.

Similarly a server's resources like CPU cycles, storage and RAM space are compromised to create more virtualized servers. So that they can perform as a sub server individually. It saves lots of money and space, just think about it that a client has an organization which may have thousands of server but not all servers are being utilized by the client completely. So he need a big space to keep those servers and resources like a team , ACs and other sort of maintenance to serve these servers to the customers. But if he does virtualization of servers so it will reduce space requirement, only few servers needs maintenance no extra money to buy servers in bulk. This is the place where virtualization takes place to utilize resources and to minimize cost and maintenance for an organization. By using virtualization we can virtualize a single server into multiple server and that server will serve as multiple servers.

It also support green computing concept. Virtualization has become an important part of cloud computing where we basically enforce on virtualization. Just because of saving wastage of resources and other network device and storage device resources as well.
There are two types of virtualization software or hypervisor available in the market,
1. vmware or hyperv
2. ESX and ESXI

vmware or hyperv

vmware and hyperv both are hypervisors and used to virtualize OS, servers, storage devices and network devices. Both are application softwares and need an operating system to install and work. vmware is vm's software whereas hyperv from Microsoft.

ESX and ESXI

ESX is a product of vmware, it is also a hypervisor but it do not require any operating system to be install. It can be install on a bare metal. ESXI is an advanced or upgraded version of ESX technology, where more features has been added to ESX to give it more power. We can virtualize more servers in an appropriate manner by using ESX.

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