Virtualization is a proven software technology that is rapidly transforming the IT landscape and fundamentally changing the way that people compute. Today’s powerful x86 computer hardware was designed to run a single operating system and a single application. This leaves most machines vastly underutilized. Virtualization concept lets you run multiple virtual machines on a single physical machine, sharing the resources of that single computer across multiple environments. Different virtual machines can run different operating systems and multiple applications on the same physical computer. Virtualizaion technology is production-proven, used by more than 170,000 customers, including 100% of the Fortune 100.
Virtual Machine Definition:
A virtual machine (VM) is an environment in virtualization concept,is usually a program or operating system, which does not physically exist but is created within another environment. In this context, a VM is called a "guest" while the environment it runs within is called a "host." Virtual machines are often created to execute an instruction set different than that of the host environment. One host environment can often run multiple VMs at once. Because VMs are separated from the physical resources they use, the host environment is often able to dynamically assign those resources among them
Pre-requisites for installing Microsoft Virtual Server 2005 R2:
x86 based 1GHz processor with L2 cache
Super VGA monitor
Network interface card
Min. 1GB-2GB RAM
5GB HDD files space
IIS enabled
Top 5 Reasons to Adopt Virtualization Software:
1. Get more out of your existing resources: Pool common infrastructure resources and break the legacy “one application to one server” model with server consolidation.
2. Reduce datacenter costs by reducing your physical infrastructure and improving your server to admin ratio: Fewer servers and related IT hardware means reduced real estate and reduced power and cooling requirements. Better management tools let you improve your server to admin ratio so personnel requirements are reduced as well.
3. Increase availability of hardware and applications for improved business continuity: Securely backup and migrate entire virtual environments with no interruption in service. Eliminate planned downtime and recover immediately from unplanned issues.
4. Gain operational flexibility: Respond to market changes with dynamic resource management, faster server provisioning and improved desktop and application deployment.
5. Improve desktop manageability and security: Deploy, manage and monitor secure desktop environments that users can access locally or remotely, with or without a network connection, on almost any standard desktop, laptop or tablet PC.
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 (i.e., 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.
Types of Virtual Machine based on their use and degree of correspondence to any real machine:
1) System Virtual Machine:
A system virtual machine provides a complete system platform which supports the execution of a complete operating system (OS).
System virtual machines (sometimes called hardware virtual machines) allow the sharing of the underlying physical machine resources between different virtual machines, each running its own operating system. The software layer providing the virtualization is called a virtual machine monitor or hypervisor. A hypervisor can run on bare hardware (Type 1 or native VM) or on top of an operating system (Type 2 or hosted VM).
The main advantages of system VMs are:
• multiple OS environments can co-exist on the same computer, in strong isolation from each other
• the virtual machine can provide an instruction set architecture (ISA) that is somewhat different from that of the real machine
• application provisioning, maintenance, high availability and disaster recovery
The main disadvantage of system VMs is: a virtual machine is less efficient than a real machine because it accesses the hardware indirectly
2) Process Virtual Machine:
A process virtual machine is designed to run a single program, which means that it supports a single process.
A process VM, sometimes called an application virtual machine, runs as a normal application inside an OS and supports a single process. It is created when that process is started and destroyed when it exits. Its purpose is to provide a platform-independent programming environment that abstracts away details of the underlying hardware or operating system, and allows a program to execute in the same way on any platform. A process VM provides a high-level abstraction — that of a high-level programming language (compared to the low-level ISA abstraction of the system VM). Process VMs are implemented using an interpreter; performance comparable to compiled programming languages is achieved by the use of just-in-time compilation.
What is a Virtual Infrastructure?
A virtual infrastructure lets you share your physical resources of multiple machines across your entire infrastructure. A virtual machine lets you share the resources of a single physical computer across multiple virtual machines for maximum efficiency. Resources are shared across multiple virtual machines and applications. Your business needs are the driving force behind dynamically mapping the physical resources of your infrastructure to applications—even as those needs evolve and change. Aggregate your x86 servers along with network and storage into a unified pool of IT resources that can be utilized by the applications when and where they’re needed. This resource optimization drives greater flexibility in the organization and results in lower capital and operational costs.
A virtual infrastructure consists of the following components:
• Bare-metal hypervisors to enable full virtualization of each x86 computer.
• Virtual infrastructure services such as resource management and consolidated backup to optimize available resources among virtual machines
• Automation solutions that provide special capabilities to optimize a particular IT process such as provisioning or disaster recovery.
Decouple your software environment from its underlying hardware infrastructure so you can aggregate multiple servers, storage infrastructure and networks into shared pools of resources. Then dynamically deliver those resources, securely and reliably, to applications as needed. This pioneering approach lets our customers use building blocks of inexpensive industry-standard servers to build a self-optimizing datacenter and deliver high levels of utilization, availability, automation and flexibility.
This gives you brief idea about virtualization concept. I hops this was helpful to you.
Refer my other blogs for other topics:
SharePoint Taxonomy
Checkpoints for creating Custom Event Handlers
Strong Named Assembly in SharePoint
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