virtual machine

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VIRTUAL MACHINES
By:
Subhash chandra gupta
1129110106
CSE 3RD YEAR

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Virtual Machine
A Virtual Machine is a software that creates
a virtualized environment between the computer
platform and the end user in which the end user
can operate software.
So, said another way:
A virtual machine implements a full computer
complete with virtual hardware.
 VM is implemented as combination of
Real hardware
Virtualizing software

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Description
 There are two types of VM
1-Process Virtual Machines
– Multiprogramming
– Emulators and Dynamic Binary Translators
– Same-ISA Binary Optimizers
– HLL (High Level Language) Virtual Machines
2-System Virtual Machines
– Whole-System Emulations
– Codesigned Virtual Machines

4. How can I use a Virtual Machine
There are three use case in virtual machine
Use Case 1: Software Testing
Virtual Machines make easily sharable testing
platforms.
Use Case 2: Education
Virtual machines are great for experimenting
with new software, operating systems, and
networked systems
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5. How can I use a Virtual Machine
Use Case 3: Datacenter
Allows software services to be consolidated
onto less actual hardware.
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6. Limitations of Virtual Machines
Virtual machines need a powerful computer.
Powerful means:
 Multiple Processors
 Lots of memory (RAM)
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Virtualization
 Virtualization is an abstraction layer that
decouples the physical hardware from the
operating system to deliver greater IT
resource utilization and flexibility.
 It allows multiple virtual machines, with
heterogeneous operating systems to run in
isolation, side-by-side on the same physical
machine.

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History
 Virtualization was first introduced in the
1960s to allow partitioning of large,
mainframe hardware.
 In the 1990s, researchers began to see how
virtualization could solve some of the
problems associated with the proliferation of
less expensive hardware, including
underutilization, escalating management
costs and vulnerability.

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Virtual Machine Monitor
 The host software that provides virtualization
is often referred to as a virtual machine
monitor (VMM) or hypervisor.
 The VMM gives each virtual machine an
illusion of a complete computer to itself.

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Architecture

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Features
 Each virtual machine has its own set of
virtual hardware (e.g., RAM, CPU, NIC, etc.)
upon which an operating system and
applications are loaded.
 The operating system sees a consistent,
normalized set of hardware regardless of the
actual physical hardware components.

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Benefits
1. Partitioning
- Multiple applications and operating
systems can be supported within a single
physical system.
- There is no overlap amongst memory
as each Virtual Memory has its own memory
space.

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Benefits
2.Isolation
-Virtual machines are completely
isolated from the host machine and other
virtual machines. If a virtual machine
crashes, all others are unaffected.
-Data does not leak across virtual
machines.

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Conclusion
 Virtual Machines create a sandbox where we can
test operating systems and other software on our
computers.
 Virtual Machines are extremely useful testing and
development tools.

16. Conclusion
 In developing and testing, Virtual Machines
can emulate diverse operating environments
for software systems.
 In enterprise, Virtual Machines can save
money by consolidating server hardware.
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17. Thank you
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