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An Introduction To Saas and Cloud Computing

This document provides an introduction to Software as a Service (SaaS), Platform as a Service (PaaS), and Infrastructure as a Service (IaaS) cloud computing models. SaaS delivers software through a browser with no installation required. PaaS provides platforms and services to build applications. IaaS provides on-demand access to virtualized computing resources like storage, servers, and networking components. All three models provide advantages like pay-per-use, scalability, security, and reliability through centralized infrastructure and services.

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200 views22 pages

An Introduction To Saas and Cloud Computing

This document provides an introduction to Software as a Service (SaaS), Platform as a Service (PaaS), and Infrastructure as a Service (IaaS) cloud computing models. SaaS delivers software through a browser with no installation required. PaaS provides platforms and services to build applications. IaaS provides on-demand access to virtualized computing resources like storage, servers, and networking components. All three models provide advantages like pay-per-use, scalability, security, and reliability through centralized infrastructure and services.

Uploaded by

stacay
Copyright
© © All Rights Reserved
We take content rights seriously. If you suspect this is your content, claim it here.
Available Formats
Download as PPT, PDF, TXT or read online on Scribd
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An Introduction to

SaaS and Cloud Computing


The hype

Cluster Computing
Cloud Computing
Grid Computing 
What is the cloud?

• IT as a service

• What is
Cloud allows access to services without user technical knowledge or control of
supporting infrastructure

• Cloud Computing?
Best described in terms of what happened to mechanical power over 100 yrs ago

• Now computers are simple devices connected to the larger cloud

• Data processing, storage and software applications that used to run locally are now being
supplied by big central computing stations. They're becoming, in essence, computing
utilities.
SaaS
Software as a Service

PaaS
Platform as a Service

IaaS
Infrastructure as a Service
SaaS
Software as a Service
SaaS Software delivery model

• Increasingly popular with


SMEs
• No hardware or software to
manage
• Service delivered through a
browser
SaaS Advantages
• Pay per use
• Instant Scalability
• Security
• Reliability
• APIs
SaaS Examples
• CRM
• Financial Planning
• Human Resources
• Word processing
Commercial Services:
• Salesforce.com
• emailcloud
PaaS
Platform as a Service
Platform delivery model

• Platforms are built upon


PaaS Infrastructure, which is
expensive
• Estimating demand is not a
science!
• Platform management is not
fun!
Popular services

• Storage
PaaS • Database
• Scalability
Advantages

• Pay per use


PaaS • Instant Scalability
• Security
• Reliability
• APIs
Examples

• Google App Engine


PaaS • Mosso
• AWS: S3
IaaS
Infrastructure as a Service
Computer infrastructure
delivery model

Access to infrastructure stack:


– Full OS access
– Firewalls
IaaS – Routers
– Load balancing
Advantages

• Pay per use


• Instant Scalability
• Security
• Reliability
IaaS • APIs
Examples

• Flexiscale
• AWS: EC2

IaaS
SaaS
Software as a Service

PaaS
Platform as a Service

IaaS
Infrastructure as a Service
SaaS Common Factors
• Pay per use
PaaS • Instant Scalability
• Security
• Reliability
• APIs
IaaS
SaaS Advantages

• Lower cost of ownership


PaaS • Reduce infrastructure
management responsibility
• Allow for unexpected resource
IaaS loads
• Faster application rollout
SaaS Cloud Economics

• Multi-tenented
PaaS • Virtualisation lowers costs by
increasing utilisation
• Economies of scale afforded
IaaS by technology
• Automated update policy
SaaS Risks

• Security
PaaS • Downtime
• Access
• Dependency
IaaS • Interoperability

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