he next big trend in the world with the popularity of internet and the requirement to manage big data resources economically and efficiently is

“Cloud Computing”. What do we understand from the designation Cloud
Computing? To be very specific and clear in the meaning and the definition of Cloud Computing; we observe that the word ‘Cloud’ represents a virtual connection over the internet. The word ‘Computing’ is similar in the meaning and definition to a computer. As a combination, Cloud Computing is defined as the storage and access to data from the internet than from the hard disk of a computer.

Now, after we understand the meaning of cloud computing, the next big question that arises in our mind is ‘Why cloud computing?’ The answer to this question lies in the fact that the management of big data resources and the access to these resources from any end of the world can be achieved by cloud computing without the need to carry extensive hard drives to manage multiple big data files wherever we go. Hence we see that it reduces the cost and helps in effective management of useful data and provides flexible access from any corner of the world.

Now let us begin with How a Cloud works? This is the next big question once we understand what cloud computing means. For getting into a deeper understanding about the working of Cloud, first of all we need to know the services offered by a Cloud. Cloud computing works and provides three layers of services to the users. The First service, Software as a service (Saas),

is the most basic layer service which provides storage solutions to individual users like the Skydrive by Microsoft or multiple software services which can be opted directly on the internet like music playback, Online movies, online games, etc. The Second service, Platform as a service (Paas), provides services to developers for application development on various platforms like java, PHP, dot net, C, C++, SQL, etc. The Third service, Infrastructure as a service (Iass), provides infrastructure resources like hardware and software to users over the internet and deploy applications on them. The users can specify the type of operating system required for them and the storage space required for the deployment of applications over the internet. All the type of services provided by the cloud are virtual and over the internet.

Now, let us look forward the working of Cloud. Let us take the example of a company like Huawei or Microsoft. These companies are licensed to provide cloud services to the multiple clients available on the internet. The second step is the installation of large racks of hard drives connected to multiple servers like Rack server or Blade server which may be of 2U, 4U or 8U capacities depending on the type of data to be stored. These companies may either setup their own rack servers or may hire it from other companies involved in the business of giving racks on lease. Further the storage locations are allocated to multiple clients by the companies on free or paid basis. The client can access the cloud services directly from over the internet anywhere at any time by only paying the charges of the internet.

There are multiple backup and security issues taken by the service provider to avoid data loss. RAID files are used to avoid data losses. RAID is the redundant array of independent disks which helps in reobtaining lost data in case of crash of server hard disks. The methods adopted by these harddisks are data mirroring, parity checking and data striping.

The Cloud computing technology has evolved as a Virtual Reality for billions of internet users over the past years and serves uncountable masses of public by providing exceptionless services like Cloud OS, Cloud Storage, Cloud Application development and much more for every user of internet being added to the cloud each day. A concluding statement would be that “The Cloud Services has always been a boon but, if the data is not made secure and not managed properly may cause the loss of crucial and confidential data to unknown sources causing a threat to masses of population…”

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