Historical development

RGPV: Cloud Computing: Unit 1




·        The history of cloud computing starts from the 1950’s and the work done by AT & T in the area of telephone networking .


·        At that time AT & T had already begun to develop an architecture and system where data would be located centrally.



·        The IT services progressed over the decades with the adoption of technologies such as Internet Service Providers (ISP) Application service Providers.


·        One of the main principles of cloud computing from SAAS (Software as a service) to provide storage on demand, is that the computing capacity varies immediately and transparently with the customer’s need.



Evolution of cloud technologies


Following types are today’s cloud implementations:-


Distributed Systems


·        A distributed system is a collection of independent computers that appears to its users as a single system and also it acts as a single computer.


·        The main and primary motive of distributed systems is to share resources and to utilize them better.



·        This is absolutely true in case of cloud computing because in cloud computing we are sharing the single  resource by paying rent.


·        The resource is single because the definition of cloud computing clearly states  that in cloud computing the single central copy of a particular software is stored in a sever .


Mainframes and thin client computing


·        It is highly reliable, powerful, centrally located form of computing service.  A user of a  mainframe system may access applications using a thin client.


·        Each mainframe system is designed to run at a high level of utilization without failure, and to support hardware up gradation.



·        The mainframes can host multiple virtual instances of operating system and this is a crucial requirement for supporting scalability within cloud computing



Utility Computing


·        Computing services that can be metered and billed to customers in the same way that electricity or telephony system operate, are known as utility computing services.


·        The concept of utility computing is also associated with the commercialization of problem solving in supercomputing systems.



Grid and Super Computing


·        The use of specialist supercomputers, or large number of computers configured to run in parallel in a ‘grid’ to solve the complex problems such as predicting the weather or decrypting data encrypted with strong encrypting algorithms is known as Grid and Super Computing.



Scalability and on demand processing power


·        The use of a supercomputer or grid computing service provides a level of scalability to those needing  resources that may be too cost prohibitive to purchase in house.


·        The processing power  within these systems can be shared and provided to multiple users concurrently to execute complex software programs.



Web 2.0


·        The global presence of the internet and the introduction of wireless networking and mobile devices featuring always on internet connectivity has raised expectations of users and demand for services over the internet.


·        Web 2.0 is the term given to describe a second generation of the World Wide Web that is focused on the ability for people to collaborate and share information online.


·        Web 2.0 basically refers to the transition from static HTML Web pages to a more dynamic Web that is more organized and is based on serving Web applications to users.



·        Other improved functionality of Web 2.0 includes open communication with an emphasis on Web-based communities of users, and more open sharing of information.


·        Over time Web 2.0 has been used more as a marketing term than a computer-science-based term.  wikis, and Web services are all seen as components of Web 2.0.






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