What is virtualization? How is it implemented? What are its benefits?

1. VIRTUALIZATION
Presented By:
AZHAR NAYEEM
MCA-Sambhram Institute of Technology,
Bengaluru.

2. What is it?
Implementation Techniques
Benefits
TALK LAYOUT

3. “Virtualization, in computing, is the
creation of a virtual (rather than actual)
version of something, such as a hardware
platform, operating system, a storage
device or network resources”
 What is it?

4. Concept is not new!!
Multi Programming – Each Process thinks it
has complete control on all of the resources.
 Virtual Memory
 CPU Sharing

5. Virtualization Architecture
o OS assumes complete control of the underlying
hardware.
o Virtualization architecture provides this illusion
through a hypervisor/VMM.
o Hypervisor/VMM is a software layer which:
 Allows multiple Guest OS (Virtual Machines)
to run simultaneously on a single physical
host.
 Provides hardware abstraction to the running
Guest OSs and efficiently multiplexes
underlying hardware resources.

6. VIRTUALIZATION LAYER
HARDWARE
ApplicationApplication
OSOS
ApplicationApplicationApplicationApplication
OSOSOSOS

7. Types of Virtual Machines
Process view of machine
o Memory, user-level
instr., system calls for
OS functions.
o OS interface to
hardware defines view
of process.
o e.g. Java, .Net,
Emulators
System view of machine
o Environment to
support multiple
processes.
o Sharing resources.
o Hardware
characteristics
defines system view.
o e.g., VMware, Xen,
VirtualBox, UMLinux

8.  Cloud can exist without Virtualization, although
it will be difficult and inefficient.
 Cloud makes notion of “Pay for what you use”,
“infinite availability- use as much you want”.
 These notions are practical only if we have 
lot of flexibility
 efficiency in the back-end.
 This efficiency is readily available in Virtualized
Environments and Machines.
Importance of Virtualization in
Cloud Computing

9.  Instant provisioning - fast scalability
 Live Migration is possible
 Load balancing and consolidation in a
Data Center is possible.
 Low downtime for maintenance.
 Virtual hardware supports legacy operating
systems efficiently.
 Security and fault isolation
Benefits of using Virtual Machines

10. Load Balancing = Better Response Time
B A BA

11.  You don’t have to own the hardware.
 You “rent” it as needed from a cloud.
 There are public clouds
e.g. Amazon EC2, and now many others
(Microsoft, IBM, Sun, and others ...).
 A company can create a private one
With more control over security, etc.
Cloud computing takes
virtualization to the next step:

12. THANK YOU!..