Abstraction and Virtulazation

What do you mean by abstraction in cloud computing?

It means hiding complexity and only show what user needs.

Simple Example:
When you use Google Drive, you don’t know:

• where your data is stored

• which server is used

• how storage is managed

That’s abstraction.

Why abstraction is important?

It is important because:

1. Simplicty: User don’t need technical knowledge

2. Efficiency: It should manage everything internally.

3. Scalability: Resource inc/dec automatically

4. Security: Internal system are hidden

5. Flexibility: Use service without worry.

Layers in abstraction?

1. Hardware level abstraction

2. Virtualization Layer

3. Infrastructure Abstraction (IaaS)

4. Platform Abstraction (PaaS)

5. Application Abstraction (SaaS)

Hardware level abstraction

In this physical server are hidden and it get managed by cloud provider

Virtualization layer?

In this instead of physical resources we have virtual resources

In this one server has multiple virtual machiines

It uses hypervisors

Infrastructure abstraction (IaaS)

It provides virtual machines , storage and network
It get controlled by OS

Platform Abstraction

It provides

OS, Runtime
Developers only write code

Application Abstraction ( SaaS )

In this complete software ready to use

- In this user just use app

What are the types of abstraction?

1. Access Abstraction

2. Application Abstraction

3. CPU Abstraction

4. Storage Abstraction

5. Network Abstraction

SCAAN

Access abstraction?

it hides the complexity of how cloud services are accessed ,it provide a simple interfaces like web browser or mobile applications

Ex: Gmail
We use gmail without knowing ki how data will travel

Application Abstraction

Application abstraction hides the internal working of application, it allows user to use them without knowledge of OS or hardware

We use google docs without installing software mm

Cpu abstraction

cpu abstraction in this physical CPU up to virtual cpus

It allows multiple users to share the same hardware

storage abstraction

storage abstraction hides the physical location and structuere of data storage

network abstraction

It hides the complexity of network infrastructure which connects multiple cloud services.

Virtualization

It is a technology of creating virtual (version) of physical resources

like server,storage,network and OS

it allows one physical machine to run multiple virtual systems

Idea behind Virtualization

One powerful computer being divided into many smaller computers and each work independently

each smaller computer = Virtual machine

How virtualization work ?

It works using hypervisior

Hypervisior:
It work as a bridge between physical and virtual machine
Manage resources

What are the types of hypervisor?

Type 1. Bare Metal
Type 2. Hosted

Bare Metal

It runs directly on hardware.
Faster and secure

Ex: Microsoft Hyper-V

Hosted

Runs on top of Operating system
slow
Ex: VirtualBox

What are virtual Machine(VM)

it is a software based computer

It runs thier own OS

It behaves as real system

Each VM are isolated from others

What are the types of Virtualization?

1. Access virtualization

2. Application Virtualisation

3. CPU Virtualization

4. Storage Virtualization

Access virtualization:

It allows user to access application and data from any device without dependency on physical system

Application Virtualization

Application Virtualization enables apps to run independently on operating system without being fully installed on local machines.

CPU Virtualization

Application virtualization allows a single physical processor to divide into multiple virual machines

One CPU → multiple virtual CPUs.

Storage Virtualization

Storage virtualisation combines multiple physical storage devices into a single logical storage unit. which makes it efficient to manage

What are the benifits of virtualization?

• Better resource utilization

• Cost Reduction

• Scalability

• Isolation

• Flexibility

Disadvantages of virtualization

Security risk

Requires high management skills