Cloud Computing , a computing paradigm is one of the
easiest means of accessing and storing data over the
Internet, instead of storing data in the computer hard drive.
It is also recognized as a large pool of systems that helps
us to remain connected with private or public networks and
to provide dynamically scalable infrastructure for data, file
storage and application.
With the launch of this technology, it significantly abridged
the storage of content, delivery, cost of computation, and
application hosting. It has a potential of transforming a
data center from a capital-intensive set up to a variable
priced milieu.
According to one of the research industries - Forrester,
defines Cloud Computing as a pool of abstracted, highly
scalable, and managed compute infrastructure capable of
hosting end customer applications and billed by
consumption. Whereas, the U.S. National Institute of
Standards and Technology (NIST) has developed the
definition of Cloud Computing as a model for enabling
convenient, on-demand network access to a shared pool of
configurable computing resources (e.g., networks, servers,
storage, applications, and services) that can be rapidly
provisioned and released with a minimal management effort
or service provider interaction.
The characteristic of Cloud Computing consists of self-
service, where a customer can request and manage their
own computing resources. An access to the broad network
permits service to be available for the private networks or
the Internet. This technology provides a pool of shared
resources, where the customer draws from a pool of
computing resources, usually in a remote data centre.
Cloud Computing service models
The services of Cloud Computing are clustered in three
categories - Software-as-a-Service (SaaS), Platform-as-a-
Service (PaaS) and Infrastructure-as-a-Service (IaaS).
Software-as-a-Service (SaaS)
In this service model, the cloud based applications are
offered to the customer, as a service on demand. It is a
single instance of the service that runs on distant
computers "in the cloud" which are owned and operated by
others and gets connected to users' computers via the
Internet and, usually, a web browser. Social networking
sites like Facebook, Twitter, Flickr and Google are all
examples of SaaS, though users able to access the
services via any Internet enabled device.
Platform-as-a-Service (PaaS)
The platform-as-a-service (PaaS) model is a level above
the Software-as-a-Service setup and provides hardware,
network and operating system, so that a customer can
design its own application and software. In order to meet
the requirements of the applications such as scalability and
manageability, a predefined combination of Operating
System OS and application servers is offered by PaaS
providers such as restricted J2EE, LAMP platform (Linux,
Apache, MySql and PHP), etc., for example, at every stage
of the process to develop, test and ultimately host their
websites, web developers can use individual PaaS
environments.
Infrastructure-as-a-Service (IaaS)
Infrastructure-as-a-Service (IaaS) is a basic computing and
storage capability, which is provided by a standardized
service over the network. This model has made the
workload easier by pooling data centre space, storage
systems, networking equipment, servers, etc. together and
making them available. In addition to it, the customer can
develop and install its own operating systems, software and
applications.
Cloud Computing deployment models
To make available and to deploy applications, enterprises
can choose Cloud Computing on Public, Private or Hybrid
clouds. In order to determine the right cloud path for each
organization, Cloud Integrators play a vital role.
Public Cloud
By and large, services provided by a public cloud are
offered over the Internet and are operated and owned by
companies, which use it to offer swift access to reasonable
computing resources to other organizations or individuals.
Through this deployment model, consumers don't need to
purchase supporting infrastructure, hardware or software,
which is owned and managed by providers.
Private Cloud
In this deployment model, the infrastructure of the cloud is
solely operated for a specific organization and is managed
by the organization or a third party. While providing more
control of resources and steering clear of multi-tenancy,
private clouds exist to take advantage of the various
cloud's efficiencies.
Hybrid Clouds
This deployment model of Cloud Computing coalesces both
public and private cloud models. A service provider can
utilize third party Cloud Providers in a full or partial manner
amid hybrid clouds, and thus escalating the flexibility of
computing.
Hence, for the everyday computer user, this technology
provides numerous options as well as to large and small
businesses. And for organizations and individuals, Cloud
Computing offers benefits, and the action moves to the
interface flanked by multiple groups of service consumers
and suppliers.
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Article Source: http://EzineArticles.com/expert/
James_Powell/2192987
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