Cloud computing
- 2. What is cloud computing? • In the simplest terms, cloud computing means storing and accessing data and programs over the Internet instead of your computer’s hard drive.
- 3. Components of cloud • The Client-end users These are the devices which interact with the users. For ex:-mobiles. • Datacenter It is the collection of severs where application is placed and accessed. • Distributed servers Often servers are at geographically different places, but they are working next to each other.
- 5. Service Models • Infrastructure as a service (IaaS) • Platform as a service (PaaS) • Software as a service (SaaS)
- 6. Infrastructure as a service • This means you're buying access to raw computing hardware over the Net, such as servers or storage. • Example of IaaS:- Ordinary web hosting is a simple example of IaaS:
- 7. Platform as a service • This means you develop applications using Web-based tools so they run on systems software and hardware provided by another company. • Examples of PaaS:- Google App Engine, Force.com (from salesforce.com)
- 8. Software as a service • This means you use a complete application running on someone else's system. • Examples of SaaS:- Web-based email and Google Documents are perhaps the best-known examples.
- 9. Types of cloud • Public cloud Available to general public or large industry group and is owned by an organisation selling cloud services. Ex:- Amazon • Private cloud Operated solely for an organisation or a company. • Hybrid cloud Combination of public and private but bounded by standardised technologies.
- 10. Advantages • Convenience. We can access our data anywhere we can connect to the Internet. • Security. Most companies use industrial level security software and practices which make it harder for hackers to get at your data. • Backups. We have a backup of our data in case your local computer crashes. • Collaboration. With our permission, others can access, view, and modify your documents. • Environmentally friendly. It takes fewer resources to cloud compute, thus saving energy.
- 11. Disadvantages • Security breaches. If there is a compromise of the server(s) where our data is stored, our personal information may be exposed to the world. • Outages. Sometimes we are unable to access to many application due to our provider being down. This leads to most inconvenient situations. • Storage limits. We have to pay, when we have to store more data beyond the limit of local hard. There also may be a limit on the size of the data that can be stored.
- 12. Continue... • Slow speeds. Uploading and downloading of large documents may take a long time. • Limited features. If we use remote software that’s provided by the storage service to manipulate and modify our data, it usually lacks the features of a program running locally.
- 13. Some examples of cloud computing • Facebooks’ cloud computers and software are good for connecting with friends and family, and giving yourself an online identity. • Apple’s iCloud computers are good at storing and syncing your stuff like music, pictures, calendars etc across your Apple devices (iPod, iPhone, iMac etc). • Amazon’s Kindle cloud computers are good at storing and syncing the eBooks you buy from Amazon.
- 14. Continue.... • Some of the biggest cloud computing services are Web- based e-mail. It also means that your e-mail is accessible from anywhere. • Recently nation’s health IT infrastructure selected a cloud computing platform to manage the selection and implementation of Electronic Health Record (EHR) systems across the country.