Cloud Architecture (Unit 2)

Cloud Architecture - CA - Unit 2 - SRMIST Syllabus - Short Notes

Virtualization

Hypervisor

A software that allows running multiple OS concurrently on a single machine. It has 2 components - Kernel & VMM 

Types

• Bare-Metal - Required hardware.
• Hosted - Runs on OS.

Benefits

• Server consolidation - The server takes a lesser load.
• Isolation - Separating VMs. 
• Encapsulation
• Hardware Independence
• Reduced Cost - Can run multiple instances. (Linux, Windows, Ubuntu in one PC)

 Abstraction Levels

Architecture

• Hypervisor Architecture
• Xen Architecture
• 
  
  
  
• Binary Translation
• Full virtualization
• Host Based virtualization
• 
  
  
  
• Para Virtualization
• 

Types

• Hardware Virtualization
• Hardware Assisted
• CPU Virtualization
• Memory Virtualization
• I/O Virtualization
• Full
• Para
• Server Virtualisation
• Hypervisor
• Full
• Para
• OS
• Hardware Assisted
• Kernel Level

Parallel Processing

Components (Uni-Processor System)

• Hardware Architecture - Communication of data memory with program memory.
  
• Pipelining - The fetch, decode, and execute commands.
  
  
  
• Superscalar Machine - Instruction-level parallelism for multiprocessing.
  
  
  
• Memory Hierarchy - Functionality of memory during multiprocessing.
  
  
  
• Multiprogramming & Time Sharing

Flynn's Classification

• SISD - Single instruction on single data.
• SIMD - Array Processors
• MISD - Non-existent.
• MIMD - Multiprocessors.

Vector Processing

SMP VS MPP

• UMA & NUMA

Web Services

Components

• SOAP - Request &response protocol.
• UDDI
• WSDL - Creates interface for API
• XML - Web-based communication.
  
  
  

SOA

• Logical View
• Message Orientation
• Description Orientation
• Granularity
• Network Orientation
• Platform-neutral

REST

Principles

• Resource Identification through URIs
• Uniform, Constrained Interface
• Self-Descriptive Message
• Stateless Interaction 

NOTE

*Theory for each point must be known. This article provides the points that must be known under each concept and diagrams that may be of use.