1. Introduction to Cloud Computing
Cloud computing refers to both the applications delivered as services over the Internet and the hardware and systems software in the data centers that furnish those services. The data town hardware and software is what we will call a Cloud. Cloud computing is relatively new belief and it has become favorite recently. Cloud leverages virtualization technology and in the essence of Cloud computing there is a logical separation in the middle of separate nodes, each node appears as a separate corporal engine to the user. Unlike grid computing, it makes several distributed computers related together to form a big logical computer which can handle large whole of data and computation. In case of Cloud computing the virtualization technology makes it inherent to have each node appear as detach corporal engine allowing user to load institution software and operating law on each node and configure institution rules for each node.
The idea of Cloud computing is evolved from parallel processing, distributed computing and grid computing. There is a bit similarity in the middle of them but they work differently. Although Cloud computing is an emerging field of computer science, the idea has been colse to for a few years. It's called Cloud computing because the data and applications exist on a "cloud" of Web servers. To simplify the concept, Cloud computing can be defined as simply the sharing and use of applications and resources of a network environment to get work done without concern about proprietary and management of the network's resources and applications. Agreeing to Scale, with Cloud computing, computer resources for getting work done and their data are no longer stored on one's personal computer, but are hosted elsewhere to be made accessible in any location and at any time.
2. related Technology Comparison
2.1. Grid computing A form of distributed computing and parallel computing, whereby a 'super and virtual computer' is composed of a mass of networked, loosely coupled computers acting in concert to achieve very large tasks
2.2. Utility computing The packaging of computing resources, such as computation and storage, as a metered assistance similar to a primary social utility, such as electricity.
2.3. Autonomic computing
Computer systems capable of self management.
3. General mechanism
Cloud computing using facts technology as a services over the network. The belief generally encompasses of Infrastructure as a assistance (IaaS), Platform as a assistance (PaaS) Hardware as a assistance (HaaS) and Software as a assistance (SaaS). It can be the potential to rent a server or servers and run a geophysical modeling application ready anywhere. It can be the potential to (S Rupley, 2009) rent a virtual server, load software on it, turn it on and off at will, or clone it to meet a sudden workload demand. It can be storing and securing large amounts of data that is accessible only by authorized applications and users. It can be supported by a cloud supplier that sets up a platform with the potential to scale automatically in response to changing workloads. It can be using a storehouse cloud to hold application, business, and personal data. And it can be the potential to use a handful of Web services to consolidate photos, maps, and Gps facts to originate a front page in buyer Web browsers.
In a cloud computing system, there is a primary workload shift. Local computers no longer have to run applications. The network of computers that make up the cloud handles them instead. In this situation the request of hardware and software on the user's side is decreased. Let the cloud take care of it. The only thing that local computers should aware is the interface software that will run the application. Today's, a Web Browser such as Mozilla Firefox and Internet Explorer 8 is widely use as an interface software in cloud computing system.
The truth is, internet users already used some form of cloud computing. If they have an email list with a Webbased email assistance like Hotmail, Yahoo! Mail or Gmail, then they had some perceive with cloud computing. Instead of running an email agenda on a local computer, user will log in to a Web email list remotely. The software and storehouse for the list does not exist in the local computer it is on the service's computer cloud.
4. Key characteristic of Cloud Computing
Currently, there is no accepted definition or specification for Cloud Computing. It may take some time to define the key characteristics of Cloud Computing based on practices in the field.Based on practices in the areas of assistance provisioning and solution design, the following two key enabling technologies could play a vital role in this revolutionary phase of cloud computing:
4.1. Virtualization technology
Virtualization technology works to handle on how the image of the operating system, middleware, and application procreated and allocated to a corporal engine or part of the server stack away. The virtualization technology can also help reuse licenses of operating systems, middleware, or software applications, once a subscriber releases their assistance from the Cloud Computing platform.
4.2. assistance Oriented Architecture (Soa).
A assistance oriented architecture is essentially a variety of services. These services describe with each other. The communication can involve whether uncomplicated data passing or it could involve two or more services coordinating some activity. Some means of connecting services to each other is needed. The evolution of a law or software architecture is now moving towards services oriented, unlike several decades ago most of the application is stand alone and purposely for single use. Recently, the immense increase of the internet user and internet technology availability the use of software now can be rented. Giant company such as Google, Microsoft, Sun or even Amazon have this potential furnish software services instead of selling the software directly to user. The Soa is software or law architecture that addressing componentization, reusability, extensibility, and flexibility. These whole characteristic is a fundamentals need for company that are looking for reducing cost and opt to rent instead of purchase.
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