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VMware: Virtualisation Overview

Transform your Business with Virtualisation


Virtualisation dramatically improves the efficiency and availability of resources and applications in your organisation. Internal resources are underutilised under the old "one server, one application" model and IT admins spend too much time managing servers rather than innovating. An automated datacenter, built on a VMware virtualisation platform, lets you respond to market dynamics faster and more efficiently than ever before. VMware Infrastructure delivers resources, applications-even servers - when and where they're needed. VMware customers typically save 50-70% on overall IT costs by consolidating their resource pools and delivering highly available machines with VMware Infrastructure.
  • Run multiple operating systems on a single computer including Windows, Linux and more.
  • Let your Mac run Windows creating a virtual PC environment for all your Windows applications.
  • Reduce capital costs by increasing energy efficiency and requiring less hardware and increasing your server to admin ratio
  • Ensure your enterprise applications perform with the highest availability and performance
  • Build up business continuity through improved disaster recovery solutions and deliver high availability throughout the datacenter
  • Improve enterprise desktop management & control with faster deployment of desktops and fewer support calls due to application conflicts
What is a Virtual Machine?
 
 
VMware: What is a Virtual Machine?
A virtual machine is a tightly isolated software container that can run its own operating systems and applications as if it were a physical computer.  A virtual machine behaves exactly like a physical computer and contains it own virtual (ie, software-based) CPU, RAM hard disk and network interface card (NIC).

An operating system can't tell the difference between a virtual machine and a physical machine, nor can applications or other computers on a network. Even the virtual machine thinks it is a "real" computer.  Nevertheless, a virtual machine is composed entirely of software and contains no hardware components whatsoever. As a result, virtual machines offer a number of distinct advantages over physical hardware.

Virtual Machines Benefits


In general, VMware virtual machines possess four key characteristics that benefit the user:
  • Compatibility: Virtual machines are compatible with all standard x86 computers
  • Isolation: Virtual machines are isolated from each other as if physically separated
  • Encapsulation: Virtual machines encapsulate a complete computing environment
  • Hardware independence: Virtual machines run independently of underlying hardware

Compatibility

Just like a physical computer, a virtual machine hosts its own guest operating system and applications, and has all the components found in a physical computer (motherboard, VGA card, network card controller, etc). As a result, virtual machines are completely compatible with all standard x86 operating systems, applications and device drivers, so you can use a virtual machine to run all the same software that you would run on a physical x86 computer.

Isolation

While virtual machines can share the physical resources of a single computer, they remain completely isolated from each other as if they were separate physical machines. If, for example, there are four virtual machines on a single physical server and one of the virtual machines crashes, the other three virtual machines remain available. Isolation is an important reason why the availability and security of applications running in a virtual environment is far superior to applications running in a traditional, non-virtualized system.

Encapsulation

A virtual machine is essentially a software container that bundles or "encapsulates" a complete set of virtual hardware resources, as well as an operating system and all its applications, inside a software package. Encapsulation makes virtual machines incredibly portable and easy to manage. For example, you can move and copy a virtual machine from one location to another just like any other software file, or save a virtual machine on any standard data storage medium, from a pocket-sized USB flash memory card to an enterprise storage area networks (SANs).

Hardware Independence

Virtual machines are completely independent from their underlying physical hardware. For example, you can configure a virtual machine with virtual components (eg, CPU, network card, SCSI controller) that are completely different from the physical components that are present on the underlying hardware. Virtual machines on the same physical server can even run different kinds of operating systems (Windows, Linux, etc).

When coupled with the properties of encapsulation and compatibility, hardware independence gives you the freedom to move a virtual machine from one type of x86 computer to another without making any changes to the device drivers, operating system, or applications. Hardware independence also means that you can run a heterogeneous mixture of operating systems and applications on a single physical computer.

Use Virtual Machines as the Building Blocks of your Virtual Infrastructure

Virtual machines are a fundamental building block of a much larger solution: the virtual infrastructure. While a virtual machine represents the hardware resources of an entire computer, a virtual infrastructure represents the interconnected hardware resources of an entire IT infrastructure—including computers, network devices and shared storage resources. Organizations of all sizes use VMware solutions to build virtual server and desktop infrastructures that improve the availability, security and manageability of mission-critical applications.


Try our web-based TCO Calculator that estimates the return on investment of VMware Infrastructure, the industry’s most robust virtualization software suite, and provides a detailed report of potential cost savings.  The VMware TCO Calculator is free of charge and available today at www.vmware.com/go/calculator.