Chapter 2. What Is Cloud Computing?
If you look back to the Industrial Revolution and its impact on the world economy, the revolution itself did not take place overnight, but through waves of changes. If you move forward to the adoption of the Internet, the Internet has also developed through waves of changes. Cloud computing has the potential to be the next disruptive wave.
This chapter describes:
Cloud computing technology components
Cloud services delivery
Key drivers for adopting the cloud
The impact of cloud computing on the continuum of users
The impact of cloud computing on application developers
Key enablers that must evolve to break down current barriers for cloud computing to succeed
Cloud Computing Defined
Our definition of cloud computing is based on five attributes: multitenancy (shared resources), massive scalability, elasticity, pay as you go, and self-provisioning of resources.
- Multitenancy (shared resources)
Unlike previous computing models, which assumed dedicated resources (i.e., computing facilities dedicated to a single user or owner), cloud computing is based on a business model in which resources are shared (i.e., multiple users use the same resource) at the network level, host level, and application level.
- Massive scalability
Although organizations might have hundreds or thousands of systems, cloud computing provides the ability to scale to tens of thousands of systems, as well as the ability to massively scale bandwidth and storage space.