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Virtual Machine in Operating System - (BCA / B.Tech)

Virtual Machine in Operating System:

Introduction to Virtual Machine (VM):

A Virtual Machine (VM) is an emulation or software-based simulation of a computer system that provides the functionality of a real computer without physical hardware. It is created in an isolated environment where users can run different operating systems and software as if they were running on a physical computer.

Definition of a Virtual Machine:

A virtual machine is an isolated environment that runs as a software on top of a computer system. It emulates hardware resources like CPU, memory, storage, and networking, so that an operating system and applications feel as if they are running on physical hardware.

Types of Virtual Machines:

System Virtual Machine: Allows a complete operating system to run on a host system.
Process Virtual Machine: Provides an isolated environment for a specific application or process (e.g., Java Virtual Machine - JVM).

History of Virtual Machines:

The concept of virtual machines was developed in the 1960s by IBM for its mainframe computers. In the 1990s, virtualization technology entered the world of personal computing when VMware introduced its first virtualization software.

Components of a Virtual Machine:

Hypervisor: A software layer that works between the host machine's hardware and the virtual machines. Type 1 (Bare Metal) runs directly on hardware; Type 2 (Hosted) runs on top of a conventional OS.
Virtual Hardware: Provided by the hypervisor, including CPU, RAM, storage, etc.
Guest Operating System: The OS that runs inside the virtual machine.
Virtual Disk Image: A software emulation of a real disk where the guest OS and application data are stored.

Advantages of Virtual Machines:

Efficient Use of Hardware, Isolation, Portability, Flexibility, Security, and foundational for Cloud Computing.

Disadvantages of Virtual Machines:

Performance Overhead, high Resource Requirements, Complexity in setup and management, and potentially high Licensing Costs.

Uses of Virtual Machines:

Testing and Development, Cloud Hosting, Consolidation of IT Infrastructure, and Data Recovery.

Virtual Machine in Operating System

Virtual Machine in Operating System:

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