Cloud computing is a model for enabling ubiquitous, convenient, on-demand network access to a shared pool of configurable computing resources that can be rapidly provisioned and released with minimal management effort or service provider interaction. Key characteristics include pay-per-use pricing, elastic scalability, and the ability to access services from anywhere via the internet. Common cloud service models are SaaS, PaaS, and IaaS. Major cloud providers offer storage, computing, and development platforms on a utility computing basis.

1. CLOUDCLOUD
COMPUTINGCOMPUTING
Submitted by
M.SowmiyaM.Sowmiya
Modified from Mark Baker

2. WHAT IS CLOUD COMPUTING?
 Cloud Computing is a general term used to describe
a new class of network based computing that takes
place over the Internet,
 basically a step on from Utility Computing
 a collection/group of integrated and networked
hardware, software and Internet infrastructure
(called a platform).
 Using the Internet for communication and
transport provides hardware, software and
networking services to clients
 These platforms hide the complexity and details of
the underlying infrastructure from users and
applications by providing very simple graphical
interface or API (Applications Programming
Interface).
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3. WHAT IS CLOUD COMPUTING?
 In addition, the platform provides on demand
services, that are always on, anywhere, anytime
and any place.
 Pay for use and as needed, elastic
 scale up and down in capacity and functionalities
 The hardware and software services are available
to
 general public, enterprises, corporations and
businesses markets
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4. CONTINUED….
 Cloud computing is an umbrella term used to
refer to Internet based development and
services
 A number of characteristics define cloud
data, applications services and
infrastructure:
 Remotely hosted: Services or data are hosted on
remote infrastructure.
 Ubiquitous: Services or data are available from
anywhere.
 Commodified: The result is a utility computing
model similar to traditional that of traditional
utilities, like gas and electricity - you pay for what
you would want!
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5. CLOUD ARCHITECTURE
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6. WHAT IS CLOUD COMPUTING
 Shared pool of configurable computing
resources
 On-demand network access
 Provisioned by the Service Provider
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Adopted from: Effectively and Securely Using the Cloud Computing Paradigm by peter Mell, Tim Grance

7. CLOUD SERVICE MODELS
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Software as a
Service (SaaS)
Platform as a
Service (PaaS)
Infrastructure as a
Service (IaaS)
Google
App
Engine
SalesForce CRM
LotusLive
Adopted from: Effectively and Securely Using the Cloud Computing Paradigm by peter Mell, Tim Grance

8. SAAS MATURITY MODEL
Level 2: Configurable per
customer
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Source: Frederick Chong and Gianpaolo Carraro, “Architectures Strategies for Catching the Long Tail”
Level 3: configurable &
Multi-Tenant-Efficient
Level 1: Ad-Hoc/Custom –
One Instance per customer
Level 4: Scalable,
Configurable & Multi-
Tenant-Efficient

9. DIFFERENT CLOUD
COMPUTING LAYERS
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Application Service
(SaaS)
Application Platform
Server Platform
Storage Platform Amazon S3, Dell, Apple, ...
3Tera, EC2, SliceHost,
GoGrid, RightScale, Linode
Google App Engine, Mosso,
Force.com, Engine Yard,
Facebook, Heroku, AWS
MS Live/ExchangeLabs, IBM,
Google Apps; Salesforce.com
Quicken Online, Zoho, Cisco

10. Services
Application
Development
Platform
Storage
Hosting
CLOUD COMPUTING SERVICE
LAYERS
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Description
Services – Complete business services such as
PayPal, OpenID, OAuth, Google Maps, Alexa
Services
Application
Focused
Infrastructure
Focused
Application – Cloud based software that eliminates
the need for local installation such as Google Apps,
Microsoft Online
Storage – Data storage or cloud based NAS such
as CTERA, iDisk, CloudNAS
Development – Software development platforms used
to build custom cloud based applications (PAAS &
SAAS) such as SalesForce
Platform – Cloud based platforms, typically provided
using virtualization, such as Amazon ECC, Sun Grid
Hosting – Physical data centers such as those run
by IBM, HP, NaviSite, etc.

11. BASIC CLOUD CHARACTERISTICS
 The “no-need-to-know” in terms of the
underlying details of infrastructure,
applications interface with the infrastructure
via the APIs.
 The “flexibility and elasticity” allows these
systems to scale up and down at will
 utilising the resources of all kinds
 CPU, storage, server capacity, load balancing, and
databases
 The “pay as much as used and needed”
type of utility computing and the “always
on!, anywhere and any place” type of
network-based computing.
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12. SOFTWARE AS A SERVICE (SAAS)
 SaaS is a model of software deployment
where an application is hosted as a service
provided to customers across the Internet.
 Saas alleviates the burden of software
maintenance/support
but users relinquish control over software
versions and requirements.
 Terms that are used in this sphere include
Platform as a Service (PaaS) and
Infrastructure as a Service (IaaS) 12

13. WHAT IS THE PURPOSE AND
BENEFITS?
 Cloud computing enables companies and
applications, which are system infrastructure
dependent, to be infrastructure-less.
 By using the Cloud infrastructure on “pay as
used and on demand”, all of us can save in
capital and operational investment!
 Clients can:
 Put their data on the platform instead of on their
own desktop PCs and/or on their own servers.
 They can put their applications on the cloud and
use the servers within the cloud to do processing
and data manipulations etc.
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14. SOME COMMERCIAL CLOUD
OFFERINGS
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15. CLOUD STORAGE
 Several large Web companies are now
exploiting the fact that they have data
storage capacity that can be hired out to
others.
allows data stored remotely to be temporarily
cached on desktop computers, mobile phones
or other Internet-linked devices.
 Amazon’s Elastic Compute Cloud (EC2)
and Simple Storage Solution (S3) are well
known examples
Mechanical Turk
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16. AMAZON SIMPLE STORAGE
SERVICE (S3)
 Unlimited Storage.
 Pay for what you use:
 $0.20 per GByte of data transferred,
 $0.15 per GByte-Month for storage used,
 Second Life Update:
 1TBytes, 40,000 downloads in 24 hours - $200,
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17. UTILITY COMPUTING – EC2
 Amazon Elastic Compute Cloud (EC2):
 Elastic, marshal 1 to 100+ PCs via WS,
 Machine Specs…,
 Fairly cheap!
 Powered by Xen – a Virtual Machine:
 Different from Vmware and VPC as uses “para-
virtualization” where the guest OS is modified to use
special hyper-calls:
 Hardware contributions by Intel (VT-x/Vanderpool) and
AMD (AMD-V).
 Supports “Live Migration” of a virtual machine between
hosts.
 Linux, Windows, OpenSolaris
 Management Console/AP 17

18. ADVANTAGES OF CLOUD
COMPUTING
 Lower computer costs
 Improved performance
 Reduced software costs
 Improved document format compatibility
 Unlimited storage capacity
 Increased data reliability
 Latest version availability
 Easier group collaboration
 Device independence
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19. DISADVANTAGES OF CLOUD
COMPUTING
 Requires a constant Internet connection
 Does not work well with low-speed
connections
 Features might be limited
 Can be slow
 Stored data might not be secure
 Stored data can be lost
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20. THE FUTURE
 Many of the activities loosely grouped together
under cloud computing have already been
happening and centralised computing activity is
not a new phenomena
 Grid Computing was the last research-led
centralised approach
 However there are concerns that the mainstream
adoption of cloud computing could cause many
problems for users
 Many new open source systems appearing that
you can install and run on your local cluster
 should be able to run a variety of applications on these
systems 20

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