IaaS, PaaS and SaaS: Cloud computing with choice
When an online organization considers its cloud security, it should determine the best working options comparing all the aspects of the cloud computing functionality and the decision must be selected taking care of the business requirements and demands. Cloud computing service is categorized in three business driven models of cloud computing: Infrastructure as a service (IaaS), Platform as a service (PaaS), and Software as a service (SaaS). The terms are generally used to depict the various combinations of services and levels of cloud computing. This classification helps to choose the best combinations for various data, processes and applications according to the functionality of the business.
Infrastructure as a service (IaaS)
It is also sometimes referred to as Hardware as a Service (HaaS). It is a provision model whereby equipment are outsourced and are used to help operations, including hardware, storage, networking components and servers in an business organization. The equipment is owned by the service provider and is responsible for running, housing, and the maintenance of the equipment. It is mainly a physical server box used as hosted information storage solution, whereby computing resources and base hardware are offered by the cloud provider . The client generally pays on the basis of per-use, and can maintain the operating systems and other applications and can run through equipment of provider.
Some important features of IaaS are:
Automatic administrative functions.
Utility computing facility( cost signifies the amount of resources consumed) and billing model
Services are policy based
Virtualization of Desktop.
Platform as a service(PaaS)
It is a way of renting operating systems, storage, hardware and network capacity. This service model allows the user to rent associated services as well as virtualized servers to run the present applications or development and test of new ones, as it provides application developer tools and hence it reduces costs with the incompatibility problems. It is an outgrowth of SaaS and lies between the IaaS and SaaS, can be said intermediate. It provides an integrated development and pre- installed setup, which allows a user to manage the underlying infrastructure and hardware with the options deployed on the internet. The most versatile instance of PaaS is Facebook.
Advantages of PaaS:
Operating system features is editable and easily up-gradable.
The primary focus is on security, data protection, storage and database integration.
Its services can be used from various international sources.
Application hosting, testing, deployment and development environment.
Overall expense can be reduced by conjugation of program development attempts.
Software as a service(SaaS)
It is a software distribution model whereby the service provider hosts the applications and makes it available to users over the Internet. It is somewhat is related to the ASP (application service provider). It is basically concentrated on management of access to the business applications. The capacity provided to the user is to utilize the applications of the provider which run on a cloud infrastructure without any management procedures. The consumers of the cloud do not supposed to manage the infrastructure of the cloud and platform over which the applications run, which easily eliminates the requirement to install and run the applications on the cloud and this simplifies the support and maintenance. Gmail can be taken as the popular example of SaaS.
Advantages of SaaS:
Simplified administration and collaboration.
Updated automatically and patch management
Global accessibility and compatibility.
Software application and data are centrally hosted.
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