Cloud Computing
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Cloud computing is a network-based computing model that provides hardware, software, and services over the internet, allowing users to access resources without understanding the underlying infrastructure. Key benefits include cost savings, improved performance, instant updates, and virtually unlimited storage, while challenges include security concerns, policy issues, and reliance on internet connectivity. Despite its advantages, cloud computing may have limitations such as slower performance, data security risks, and dependence on high-speed internet connections.
Cloud Computing
- 2. Cloud Computing A new class of Network Based Computing that takes place over the Internet.
- 3. • Using Internet for providing hardware, software and networking services to clients. • A collection of integrated and networked hardware, software and Internet infrastructure (called a platform).
- 4. • These platforms hides the complexity and details of the underlying infrastructure from users.
- 5. • In addition, the platform provides on demand services, that are always on, anywhere, anytime and any place.
- 6. • The hardware and software services are available to general Public, Enterprises, Corporations and Businesses markets. • Pay for what you use.
- 7. Different Cloud Computing Layers 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
- 8. Basic Cloud Characteristics • The “no-need-to-know” in terms of the underlying details of infrastructure, applications interface with the infrastructure via the APIs.
- 9. Basic Cloud Characteristics (contd.) • The “flexibility and elasticity” allows these systems to scale up and down at will • Utilizing the resources of all kinds • CPU, storage, server capacity, load balancing, and databases
- 10. Basic Cloud Characteristics (contd.) • 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.
- 11. What is the purpose and benefits? • Cloud computing enables companies and applications, which are system infrastructure dependent, to be infrastructure-less.
- 12. What is the purpose and benefits? • By using the Cloud infrastructure on “pay as used and on demand”, all of us can save in capital and operational investment!
- 13. What is the purpose and benefits? 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.
- 14. Some Commercial Cloud Offerings
- 15. Opportunities and Challenges • Opportunities – can be used without any understanding of their infrastructure. • It potential expense for start up companies, as they would no longer need to buy their own software or servers. • Cost would be by on-demand pricing. • Vendors and Service providers claim costs by establishing an ongoing revenue stream. – Accessible from anywhere.
- 16. – Security could prove to be a big issue: • It is still unclear how safe out-sourced data is and when using these services ownership of data is not always clear. 16 • Challenges
- 17. – There are also issues relating to policy and access: • If your data is stored abroad whose policy do you adhere to? • What happens if the remote server goes down? • How will you then access files? • There have been cases of users being locked out of accounts and losing access to data. 17
- 18. Advantages of Cloud Computing • Lower computer costs: – You do not need a high-powered and high-priced computer. – Since applications run in the cloud, not on the desktop PC, your desktop PC does not need the processing power.
- 19. • Improved performance: – With few large programs hogging your computer's memory, you will see better performance from your PC. – Computers in a cloud computing system boot and run faster because they have fewer programs and processes loaded into memory…
- 20. • Reduced software costs: – Instead of purchasing expensive software applications, you can get most of what you need for free-ish! • most cloud computing applications today, such as the Google Docs suite. – better than paying for similar commercial software • which alone may be justification for switching to cloud applications.
- 21. • Instant software updates: – Another advantage to cloud computing is that you are no longer faced with choosing between obsolete software and high upgrade costs. – When the application is web-based, updates happen automatically • available the next time you log into the cloud. – When you access a web-based application, you get the latest version • without needing to pay for or download an upgrade. • Improved document format compatibility. – You do not have to worry about the documents you create on your machine being compatible with other users' applications or OSes – There are potentially no format incompatibilities when everyone is sharing documents and applications in the cloud.
- 22. • Unlimited storage capacity: – Cloud computing offers virtually limitless storage. – Your computer's current 1 Tbyte hard drive is small compared to the hundreds of Pbytes available in the cloud.
- 23. • Requires a constant Internet connection: – Cloud computing is impossible if you cannot connect to the Internet. – Since you use the Internet to connect to both your applications and documents, if you do not have an Internet connection you cannot access anything, even your own documents. – A dead Internet connection means no work and in areas where Internet connections are few or inherently unreliable, this could be a deal-breaker. Disadvantages of Cloud Computing
- 24. • Does not work well with low-speed connections: – Similarly, a low-speed Internet connection, such as that found with dial-up services, makes cloud computing painful at best and often impossible. – Web-based applications require a lot of bandwidth to download, as do large documents. • Features might be limited: – This situation is bound to change, but today many web- based applications simply are not as full-featured as their desktop-based applications. • For example, you can do a lot more with Microsoft PowerPoint than with Google Presentation's web-based offering
- 25. • Can be slow: – Even with a fast connection, web-based applications can sometimes be slower than accessing a similar software program on your desktop PC. – Everything about the program, from the interface to the current document, has to be sent back and forth from your computer to the computers in the cloud. – If the cloud servers happen to be backed up at that moment, or if the Internet is having a slow day, you would not get the instantaneous access you might expect from desktop applications.
- 26. • Stored data might not be secure: – With cloud computing, all your data is stored on the cloud. • The questions is How secure is the cloud? – Can unauthorised users gain access to your confidential data? • Stored data can be lost: – Theoretically, data stored in the cloud is safe, replicated across multiple machines. – But on the off chance that your data goes missing, you have no physical or local backup. • Put simply, relying on the cloud puts you at risk if the cloud lets you down.