Deployment Models : A Service Provider

Private cloud is an infrastructure operated solely for a single organization, whether managed internally or by a third-party, and can be hosted either internally or externally.

Furthermore, different deployment models exist, we are going to focus only on the two different poles, the private cloud and the public cloud. The former means that the cloud infrastructure is owned and operated by a single and usually the same organization, while the latter stands for a public infrastructure where basically everyone can use it under different conditions. And this is the “cloud” we will be referring to in this essay.

These administrations are extensively separated into three classifications: Infrastructure-as-a-Service (Iaas), Platform-as-a-Service (Paas) and Software-as-a-Service (Saas). Cloud computing was named motivated by the cloud image that is frequently used over the Internet through diagrams or flowcharts. Input data is analysed, collected and stored in one big online server which an authorized particular person can get access to. Margaret Rouse (December 2010). Moreover, four deployment models that have been used to deliver cloud services are private, public, community and hybrid. Private cloud is used by single organization to be able to

There are different types of cloud computing services available on the market which falls into one of the following categories.

Cloud is a trending term across the Internet and is often confused with data center and virtualization. To begin with, data center and virtualization are centric to the cloud, but scope of the cloud as a whole is much wider. To put in simple words, a cloud is a pool of large configurable resources that are available on demand over the Internet. These resources can be available in the form of storage devices, servers, processors, and network interfaces [4]. Packaging these resources to provide services to end-users is termed as cloud computing. The users are provided with an ease of accessibility

The cloud infrastructure is generally owned and managed by the service provider. Multiple customers share the computing resources provides by a single service provider, customers can quickly access these resources and only pay for the operating resources. The customer has no visibility over the location of the cloud computing infrastructure and infrastructure is shared between organizations. Public clouds are shared

In this report is basically about the introduction to the term, characteristics, services and facilities related to internet-based computing, generally known as cloud computing. Apart from that Distributed computing gives various advantages including enhanced adaptability, Scalability, and reduction in cost. At the business level, Application of essential business service models and deployment models used in business, Advantages, and

Public cloud: cloud computing model whereby a cloud service provider provision resources over the internet such as software and data storage, which clients can access through the web browser.

Cloud computing is large group of remote servers which are networked for facilitating pervasive, expedient, on-demand network access to configurable and common computing resources such as CPU processing, network bandwidth, disk space that can be quickly facilitated and reclaimed with minimum central management. The underlying complexity of such a system is handled by an Operating System which is designed to support interoperability, scalability, security, user privacy, data management, fault tolerance. These operating systems need to work proficiently in the background to ensure that all the resources are available when needed and ensure acceptable performance and quality of service.

Cloud computing system, which functions based on the concept of providing computing as a utility, can be defined as the method of providing resources for computing on demand, using remotely operational servers on the internet for data storage, processing data and managing data. Its equivalent to using a computer for its services, only without having to carry the hardware for it. Cloud applications, being dynamically scalable, agile and capable of running virtual applications and even an OS on a browser help in reducing costs of resource acquisition.

Cloud computing is the convergence of Virtualization and Utility computing. In early days of computing, both data and software were fully contained on the same user machine. Cloud computing eliminates the need for

Private cloud: Is provisioned for the exclusive use of a single organization. The infrastructure is usually owned managed and operated by the organization within its own firewall.

With the rapid change in processing and storage technologies and the success in the communication network such as Internet, lessen cost of computing resources, more powerful and more ubiquitously available than ever before. This technological change has enabled the development of a new computing paradigm called cloud computing, in which resources are shared by multiple system over the communication network. Cloud computing is a set of IT services that are provided to a business organizations or customers over a network on a leased basis and with the ability to scale up or down their service requirements. Cloud computing services are delivered by a third party provider who owns the infrastructure. Cloud computing has turned up as a new model for hosting and delivering services over the internet. Cloud computing becomes an attraction in the business world as it does not require plan for provision and business can be set up with a small amount.

Over the years, computing concepts changing from distributed to parallel to grid to cloud computing. The evolution of computing is shown in Figure 1. Now a day, people choose cloud computing because of the advantages they get from cloud computing. The advantages are scalability, reduced management efforts, on-demand resource allocation and flexible pricing model (pay-as-you-go). Cloud computing has three service models: Software-as-a-Service (SaaS), Platform-as-a-Service (PaaS) and Infrastructure-as-a-Service (IaaS). The basic concept of cloud computing and services is shown in Figure 2. Example of application or services using cloud computing are Microsoft OfficeLive, Dropbox, CluodNumbers, Google AppEngine, SalesForce

The dynamic, broad and complex nature of cloud infrastructure makes it difficult to provide resilience against design issues. In order to make user effectively utilize the existing computational power a new kind of operating systems are needed. Therefore cloud based operating systems promise vision to meet user’s needs at any time. At the same time designing of cloud based operating systems present many challenges to the designer. The common issues include heterogeneity, elasticity of demand, scalability and faults.