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You are here:Open notes-->VTU-->Unit-3-Cloud-as-a-Service

Unit 3 Cloud as a Service

3.1 Introduction

Common attributes of a cloud infrastructure are,
 Flexible pricing
 Elastic scaling
 Rapid provisioning
 Standardized offering
To support ‘IT-as-a-Service’ , the cloud infrastructure must deliver,
 Abstraction
 Virtualization
 Dynamic Allocation
 Data management

3.2 Gamut of Cloud Solutions

There are five commonly used categories
1. Platform-as-a Service(PaaS)
2. Software-as-a Service(SaaS)
3. Infrastructure-as-a Service(IaaS)
4. Storage-as-a Service(SaaS)
5. Desktop-as-a Service(DaaS)
Fig: Cloud @ Datacenter
3.2.1 Platform-as-a-Service(PaaS)
3.2.2 Software-as-a Service(SaaS)
3.2.3 Infrastructure-as-a Service(IaaS)

3.3 Principal Technology

 The main Drivers for clod computing are cost,agility,time to market.
 Infrastructure is a layer of software that
 Interact with multiple server
 Enables IT departments to pool resources together across server
 Defines standardized tiers of services called virtual compute centres
 Virtualization is the foundation for cloud

3.4 Cloud Strategy

 This section provides a high level guidance to define the cloud strategy and artefacts that capture the architecture of a cloud enabled application.

 Key steps to cloud implementation planning are

 Understand cloud strategy

 Define cloud application requirement

 Assess cloud readiness

 Define high level cloud architecture

 Identifying change management requirement

 Develop roadmap and implementation plan

3.5 Cloud Design & Implementation using SOA

Architecture Overview

Service Oriented architecture(SOA) is very useful architectural style for implementing applications in the cloud.

Language and platform independent services can be provided using standards-based , platform-agnostic SOA architecture .

3.6 Conceptual Cloud Model

Cloud Application Security & privacy Principals


Authentication & access Control

Data Protection

Logging & Alerting

3.7 Cloud Service Defined

3.7.1 Service Defined

o Service

o Service Portfolio

o Service Component

o Service Owner

o Process

o Enablers

o Service Level Agreements

o Service Level Management

o Service Level Management Objective

3.7.2 Service Scope Overview

o Platform integration & Deployment Services

o Software Platform Management Services

3.7.3 Platform Integration & Deployment Component Services

o Order management

o warehousing & Stock management

o Platform Build & Test

o Base Backup

o Data & Personality Migration

o Asset Tagging & Custom Labelling

o Asset Inventory Update & Report

o Logistics & Delivery

o Instalation

o Extended Project Management

o Platform Removal & Return

o Asset Refurbishment

o Asset & Data Disposal

o Emergency Replacement

o Software Platform Management Services

o Software Platform Design Consulting

o Software Platform Design Creation & Customisation

o Software Platform Support & Maintenance

o Application Scripting

o Application Discovery

o Application Portfolio Management

o Software Delivery

o Antivirus Management

o Patch Management

o Health Check Services

o Compliance Services

o External Services

o Internal Services

o User-Initiated Service Request

o Customer-Initiated Service Request


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