What is Cloud Computing?
The cloud computing is a major concept referring to the use of memory and computing capacity of computers and servers around the world and linked by a network such as the Internet (principle of grid computing).
The users (mostly business) no longer own their servers and computer but can access a scalable manner to many online services without having to manage the underlying infrastructure, often complex. Applications and data are no longer on the local computer, but – metaphorically speaking – in a cloud (Cloud) comprising a number of remote servers interconnected through a high bandwidth essential to the fluidity of the system. The service access is via a standard application readily available, most of the time a Web browser.
The Software as a Service (SaaS), often associated with cloud computing can be seen as an economic model of consumer applications: they are consumed and paid on demand (per user per minute of use for example) and not acquired through the purchase of licenses. SaaS can this title based on an infrastructure-type computer in the cloud “.
The concept of computing in the cloud is comparable to the distribution of electric energy. The computing power and storage of information is offered for use by specialized companies. As a result, companies no longer need to own servers, but assign this resource to a company that guarantees their computing power and storage on demand.
Markess International services are defined cloud computing as a service allowing access via the network and demand for IT resources (infrastructure, networks, storage …) and / or application services (such as SaaS, Software as a Service). According to the approaches of companies to distinguish three forms of cloud computing: the private internal clouds, the clouds and private external public clouds. This concept is grouped by the Anglo-Saxon under the term “elastic computing capacity.” The National Institute of Standards and Technology gave a brief definition that incorporates these principles.
In 2009, the study Markess International , less than 10% of respondents mentioned already use to cloud computing services in the hosting infrastructure and applications. By 2011 and beyond, companies should take an interest in increasing support for these services because, according to the type of cloud computing considered (private domestic, external private or public), they should be between two to a three to use them. The trend is still in favor of private internal clouds even if companies do not necessarily confined to those services and should undoubtedly combine the solutions together.
The pooling of material to optimize costs compared to conventional systems and accelerate the rate of development of shared applications.
As for virtualization, computing in the cloud is more economical due to its scalability. Indeed, the cost depends on the duration of the use of the service and requires no prior investment (human or machine). Note also that the elasticity of the cloud can provide scalable and therefore bear the expenses mounted.
For example, Salesforce.com, a pioneer in the field of computing in the cloud manages the data of 54 000 firms, and their 1.5 million employees, with only 1 000 servers (March 2009).
Moreover, and this is an argument put forward by the application providers in cloud hosting services are extremely reliable because based on efficient infrastructure with effective policies for fault tolerance (including replicas).
The fundamental problem remains the one hand securing access to the application between the client and the remote server.
On the other hand, companies lose control of the location of their data and lifecycle applications, and there will also further the concept of confidentiality of data (financial, inventions, marketing plans…).
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