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When virtual was first introduced in the computational sense, it applied to things simulated by the computer, like virtual memory that is, memory that is not actually built into the processor. Over time, though, the adjective has been applied to things that really exist and are created or carried on by means of computers. Virtual conversations are conversations that take place over computer networks, and virtual communities are genuine social groups that assemble around the use of e-mail, web pages, and other networked resources. (Source: Dictonary.com; http://dictionary.reference.com/search?q=virtual)
An operating system is the layer of software that communicates directly with the hardware components on a physical machine and provides the platform for applications to run on top of it. For the most part, this relationship was strictly a one-to-one relationship. In other words, the operating system would take ownership of the drivers needed to communicate with the hardware components and would not allow other software to communicate directly with it. Thus, only one operating system could run on a physical machine at a time. With virtual machine technology though, all that has changed. Now you can run multiple operating systems simultaneously on a host machine using Microsoft Virtual Server 2005.
virtual machine scenarios
Why would anyone want to run
multiple operating systems? There are many scenarios where organizations can
realize the benefits of virtual machine technology.
installation and settings
The Virtual Server 2005
installation files are very small, weighing in at less than 20 MB. Virtual
Server can be installed on any version of Windows Server 2003, including
Small Business Server. It can also be installed on a Windows XP Professional
host operating system, although for non-production use only. Windows 2000
Server host operating systems are not supported.
Installing Virtual Server 2005 is simple, with the on screen instructions
leading you through the process.
The IIS Admin and World Wide Web Publishing services are required to run Virtual Server. During installation, you specify the port which the virtual server service will be accessed, the default port being port 1024.
Once installed, a program group is created with a link to the Virtual Server Administration Website, which you can access using Internet Explorer or your favorite web browser. Configuration and administration of all virtual machines is done through the Virtual Administration Website.
creating virtual machines
To create a new virtual machine, follow the Create link via the Virtual Server Administration Website. You start by specifying the basic information for the virtual machine you are creating. This page allows you to name the virtual machine, allocate the RAM and hard drive, or use an existing hard drive if one has already been created. You can also specify the virtual network setting for the virtual machine. Once that is complete, you click ok to continue to the virtual machine configuration page. This allows you to configure additional settings for the virtual machine, such as the COM ports, floppy and CD ROM drive settings and other settings if they pertain to the virtual machine you are creating. Installing an operating system into a virtual machine is accomplished in the same manner in which you would install one onto a physical machine, so it is on this configuration page that you would set the CD ROM to either use the physical drive on the host machine, or to capture an ISO file by pointing it to the fully qualified path of the ISO.
Now that you have your new virtual machine
configured, you can proceed to install the supported operating system of
your choice. Start by clicking on the virtual machine thumbnail at the top
of the configuration page to boot the virtual machine. Installation proceeds
just as a typical installation on any physical machine would.
Virtual Server runs as a service, so you
can close the browser interface and still access the virtual machine just as
you would access a physical machine attached to your network via My Network
Places. You can also use Remote Desktop to access the desktop of the virtual
product versions & pricing
Virtual Server 2005 comes in two versions, Standard Edition and Enterprise Edition. Both versions include the same features, with the exception of the number of processors supported. Standard Edition supports up to 4 physical processors and Enterprise Edition supports up to 32 physical processors. Standard Edition is priced at $499 and Enterprise Edition is priced at $999.
Undoubtedly, Virtual Server 2005 makes sense for many situations. Cost savings and time savings can be immediately realized upon deployment. Surely there are many servers out in the workforce that are underutilized, that is to say that the processor never sees it's usage come anywhere near 100%. That being the case, running another operating system on top of that hardware instantly makes better use of the investment you have already made in the infrastructure.