Presentation of Virtual Macines slides

VIRTUAL MACHINE
Presented by : Zain Raza
Discipline : Information Technology
5th Semester

OUTLINE
 History of Virtual Machine
 Virtual Machine (VM) mean?
 Types
 Use of VM
 Virtual Machine Application
 Pros & Cons of VM

HISTORY OF VM
 VM is a family of IBM virtual machine operating
systems used on IBM mainframes System/370.
 The first version, released in 1972, was VM/370.
 This was a System/370 reimplementation of earlier
CP/CMS operating system.

VIRTUAL MACHINE MEAN?
• A virtual machine (VM) is a software program or
operating system that not only exhibits the behavior
of a separate computer, but is also capable of
performing tasks such as running applications and
programs like a separate computer.
• A virtual machine, usually known as a guest is
created within another computing environment
referred as a "host." Multiple virtual machines can
exist within a single host at one time.
• A virtual machine is also known as a guest.

TYPES OF VIRTUAL MACHINE
There are two main types of virtual machines :
One, which is called a system virtual machine, is
used to mimic all the processes and components of
an actual computer.
The other, which is known as a process virtual
machine, is used to run only a single application
and disappears when that application is closed.

SYSTEM VIRTUAL MACHINES :
 It allow a person to use a single server as if it were many
different computers.
 Using system machines also allows a user to run multiple
operating systems on the same machine.
 This allows a user to run programs that are only available on
one type of operating system.
 It also makes it possible to test a program across multiple
platforms without switching machines.
 System virtual machines (also known as full
virtualization VMs) provide a complete substitute for the
targeted real machine and a level of functionality required for
the execution of a complete operating system.

PROCESS VIRTUAL MACHINES :
 They are used to run a single program in isolation from
the physical computer’s operating system.
 This allows a user to run a program that might otherwise
be incompatible with the normal operating system.
 Each process machine is created to run a specific
program and exists only while the program is running.
 Closing the program it is running will make a process
machine disappear, and opening that program again will
create a new virtual machine.

USES OF VIRTUAL MACHINE :
 Virtual machines allow user to run an multiple operating
system on his windows desktop.
 VM use to run different software on an operating system.
 By using VM we can try different new operating systems on
your O/S.
 By using VM you can try your new software or web apps or
even site design by just building virtual machines and running
the tests there.
 When you get ready to move from XP to Vista, you can use
VMWare to make a backup of your old system.

VIRTUAL MACHINE APPLICATIONS :
There are three major virtual machine applications that run
on all three major computer operating systems
(Windows, Mac OS, and Linux).
The three virtual machine applications are:
 Parallels
 VMware
 Qemu
 KVM
 Xen
 TeamViewer
 VirtualBox.

THE MAIN PROS & CONS OF VM :
Pros :
 You can run other programs in a VM that may not
necessarily be in the same OS as the host machine.
 Ability to run more than one OS simultaneously.
 You can install/reinstall/backup/move your guest OS
easily.
 You can manage allocation of resource (Memory, Hard
disk), and etc.

THE MAIN PROS & CONS OF VM :
Cons :
 Performance drop. Usually much slower due to
the workload on the system by running virtual
machines.
 Virtual machine is not that efficient as a real one
when accessing the hardware.

Presentation of Virtual Macines slides

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