5 Introduction to Virtualization

Hello students,

We start with a new topic namely Virtualization in this lecture.

You would have come across an electric socket plug point in your house where you put in a plug to connect to one device. That device can be your TV or your mobile charger or your computer.



But how does one use the same electric socket to connect to all devices at the same time. I can use an electric extension board which has multiple electric sockets in it as output and the other end is connected to the real single electric socket input point.



In this case, your main electric point becomes the "host", the extension board becomes the "virtualization layer" and your TV, mobile and computer become the "guest"

Such type of problems are called virtualization type of problems, where you have one physical device that needs to be shared with multiple users at the same time.

Though there is one physical device, I may create three or more virtual devices (guest) out of single physical device (host) using something similar to electric extension board(virtualization layer).

Virtualization is heavily used in cloud environment because there are so many customers who needs to use the same hardware and software provided by cloud providers such as AWS, Azure, Google Cloud.

One machine is shared with more than one customer. One software is also shared with multiple customer. The ability to share a single resource with multiple customers or tenants is also called Multi-tenancy. Virtualization is an example of Multitenancy.

In this lecture we cover

  • Definition of Virtualization?
  • Five reasons why virtualization is needed?
  • How does virtualization work using the three components namely host, virtualization layer and guest ?
  • What are the four advantages and three disadvantages of virtualization?



Lecture quiz on Introduction to Virtualization

In the next few lectures, we will dig deeper into different types of virtualization, both at hardware level as well as at software level.

Virtualization is one of the key cloud technology used by cloud providers

Thank you.

Comments

Post a Comment

Popular posts from this blog

11 Computing Platforms

Welcome students ! Introduction to Unit 2  In Unit 2, we look at platform architectures that have evolved over time from the days of  earlier main frame architecture into today's cloud service platform architecture. Today we have cloud computing platform which use and provide cloud technologies   ( Parallel Computing, Distributed Computing, Service Oriented     Computing, Virtualization, Web 2.0 (soap, rest, ajax, mashup),  Utility Computing ) cloud delivery services reference model  ( IaaS,PaaS, SaaS ) cloud deployment types  ( Public, Private, Hybrid, Community ) In Unit 1 we already introduced ourselves to cloud technologies such as Parallel Computing, Distributed Computing, Service Oriented Computing and Virtualization.  Just like evolution theory says a monkey became man over many phases, this blog summarizes the Computing Platform architecture for enterprises that has evolved over time in four phases  (computing platform: e...
Read more

15 Four layers of Cloud Architecture (Reference Model)

Hello students, In today's blog we look deeper at cloud reference model architecture that generally applies in any cloud environment Any Cloud architecture is based on a four layers of this reference model 1. System Infrastructure 2. Core Middleware 3. User-level Middleware 4. Cloud Applications Each layer is on top of the previous layer System Infrastructure System infrastructure is the most underlying layer in the architecture and it provides physical machines, network, storage needs such as network adapters, routers, SAN disks etc. Core Middleware Core Middleware sits on top of System Infrastructure layer. It provides virtual machines, network virtualization, storage virtualization, hypervisors etc. Both System Infrastructure and Core Middleware essentially provides a way to implement IaaS (Infrastructure as a service) In our assignment, this layer would ideally be Oracle Virtual box User Level Middleware User Level Middleware sits on top of core middleware and provides run-ti...
Read more

25 Task Computing : HTC-HPC-MTC

Dear students, In our last blog, we came across concurrent computing, where the focus was how a single program can be computed faster by decomposing either based on data sets (Domain Decomposition) or based on functionality (Function Decomposition). Once the decomposition is planned properly in the program, it can be assigned to multiple cores or multiple threads. Concurrent computing is a form of parallelism on the same machine. When we talk about task computing, we are looking at executing not single program, but multiple programs. Each program can be considered as a task with lot of data or consisting of many work units. These tasks can be executed using multiple machines. Task Computing is a form of parallelism on multiple machines. It is a network of machines, where one machine (called local node) becomes responsible to submit the task, then one machine schedules it , checks status on all submitted tasks (access nodes) , one machine provides any resources such as files, data...
Read more