This document provides an overview of virtual machines (VMs), including what they are, common uses, benefits, types, architecture, and pros and cons. A VM is a software implementation of a machine that runs programs like a physical computer. VMs are used for testing applications in different environments, backing up systems, and running incompatible software. Benefits include cost savings from consolidating infrastructure, agility during development, scalability, security isolation, and high availability through backups and migration. Main types are system VMs for full operating systems and process VMs for application runtimes. Key software includes VMware, VirtualBox, Xen, and KVM. While VMs provide flexibility, they also use significant resources and have reduced direct

1. VIRTUAL
MACHINE
Mohammed Twaha
Srinivas University, Mukka

2. TOPICS
What is virtual machine
What are VMs used for
Benefits of using VMs
Types of virtual machine
Architecture of virtual machine
Pros and cons of VM
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4. What’s Virtual Machine ?
• Virtual Machine (VM);
A software implementation of a
machine (computer) that executes
programs like a physical machine.
A virtual machine provides an
interface identical to the underlying bare
hardware.
The operating system creates the
illusion of multiple processes, each
executing on its own processor with its
own (virtual) memory.
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5. What are VMs used for?
• Building and deploying apps to the cloud.
• Trying out a new operating system (OS), including beta
releases.
• Spinning up a new environment to make it simpler and quicker
for developers to run dev-test scenarios.
• Backing up your existing OS.
• Accessing virus-infected data or running an old application by
installing an older OS.
• Running software or apps on operating systems that they
weren't originally intended for.
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6. What are the benefits of using VMs?
• Cost savings—running multiple virtual environments from one
piece of infrastructure means that you can drastically reduce
your physical infrastructure footprint.
• Agility and speed—Spinning up a VM is relatively easy and
quick and is much simpler than provisioning an entire new
environment for your developers. Virtualization makes the
process of running dev-test scenarios a lot quicker.
• Scalability—VMs allow you to more easily scale your apps by
adding more physical or virtual servers to distribute the
workload across multiple VMs.
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7. • Security benefits— Because virtual machines run in multiple
operating systems, using a guest operating system on a VM
allows you to run apps of questionable security and protects
your host operating system. VMs also allow for better security
forensics, and are often used to safely study computer viruses,
isolating the viruses to avoid risking their host computer.
• Lowered downtime—VMs are so portable and easy to move
from one hypervisor to another on a different machine—this
means that they are a great solution for backup, in the event the
host goes down unexpectedly.
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8. Types of Virtual Machine :
• System virtual machines – Hardware virtual machine Provides a
complete system platform environment which supports the execution
of a complete operating system (OS).
• Process virtual machine – Application virtual machine Provides a
platform-independent programming environment that abstracts away
details of the underlying hardware or operating system from software
or application runtime.
• Example:
• Hardware virtual machine: VMWare, Xen, Virtual box .
• Application virtual machine: Java Virtual Machine, .NET Framework
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9. Virtual Machine Architecture
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10. Advantages of VM
• Familiar Interfaces
• Isolation
- Each OS Run separately with Its own Virtual resources.
• High Availability
- If one VM Server is failed then easily access data from another one.
• Scalability
- Add or Remove resources easily
• Backup with Fast Recovery
- Using VMDK data recovery tool
• Reduction of Cost
- It save cost by running multi OS on single machine.
- Sharing o Hardware

11. Disadvantages of VM
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• Difficulty in direct access to hardware.
• Great RAM consumption since each virtual machine will
occupy a separate area of the Same.
• Great use of disk space, since it takes all the files for each
operating system installed on each virtual machine.
• A virtual machine is less efficient than an actual machine
when it accesses the host hard drive indirectly.

12. Popular Virtual Machine Software
• Virtual BOX
• XEN
• VMware Workstation
• Citric
• KVM
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