Cloud computing allows users to access computing resources like software, data storage, and processing power over the internet rather than maintaining and operating them locally. It provides resources on demand in a manner similar to a public utility. The document discusses the background of cloud computing including its origins in centralized mainframe systems. It outlines the key characteristics, economics, layers, types, advantages, and disadvantages of cloud computing and provides examples of cloud computing vendors and services.

1. CLOUD COMPUTING

2. Introduction
Cloud computing is where computing resources
are accessed from a virtual online "cloud" rather
than a local desktop or organizational data centre.

3. Contents
Background
Characteristics
Economics
Layers
Types
Advantages and
Disadvantages
Conclusion

4. Definition
Cloud computing is internet–based
computing, whereby:
 shared resources
 software
 information
are provided to computers and others devices
on demand, like the electricity grid.

5. Background
Reincarnation of centralized data processing
and storage as paralleled by the mainframe.
A mainframe (also known as Big Iron) is:
A large computer
Used by large organization
Used for bulk data processing

6. Background
A large network of computers.
Used by large organizations to provide
services to smaller ones and individuals.
Used for bulk data processing.
Synonyms: Grid Computing, SaaS, Network
Computing, Utility Computing.

7. Characteristics
Virtually Pay-per-use
assemble
Offsite Shared
Characteristics workloads
technology
Massive
On-demand scale
self service

8. Economics

9. Companies are looking for new ways to:
Reduce costs Faster time to
Increase reliability
value
• Pay for only what • Improve system • Quickly take
we use reliability advantage of
• Reduce hardware • Improve system latest
investment availability technologies
• Reduce software • Simplify updating
licenses and upgrading
• Lower labor and IT • Increase speed of
support costs deployment
• Lower outside • Scale IT resources
maintenance cost to meet business
needs

10. Layers of the cloud
Client
Application
Platform
Infrastructure
Server

11. Important topics of cloud
computing
• The various types and vendors of cloud
computing services
• Advantages and disadvantages of cloud
computing

12. Types and vendors of cloud
computing services
Simplest form
Types of cloud
computing
More complex
form

13. Simplest form
Search engines
Webmail
BACK

14. More complex form
1. Web–based office application.
 Online photo and document sharing
Eg: ZOHO Work Online, Live Mesh
2. Branded, Domain-wide web service.
 Hosted spam filtering
Eg: postini, Google apps, Microsoft Office Live Beta
3. Large-scale web-based storage and computing power for
building your own application.
Eg: Amazon web services, Google app Engine
BACK

15. Advantages and disadvantages
• Lower software cost
• Improve performance
Advantages • Fewer maintenance issue
• Instant software updates
• Increased data safety
• Requires a constant internet
connections
• Doesn’t not work well in low
Disadvantages speed connections
• May be slow
• Limited features

16. Conclusions
Cloud computing increases profitability by
improving resource utilization. Costs are driven
down by delivering appropriate resources only for
the time those resources are needed.
 Cloud computing has enabled teams and
organizations to streamline lengthy procurement
processes.

17. Reference
• Wikipedia: Cloud Computing.
en.wikipedia.org/wiki/Cloud_computing
• Wikipedia: Mainframe Computer.
en.wikipedia.org/wiki/Mainframe_computer