There are many definitions of public clouds, but in essence we are talking about approach, in which IT is not placed on your site, and users connect through a network of infrastructure that is not yours. We can distinguish cloud services in three models.

“Software as a service” (SaaS): This model is as old as the networking technology. Application is hosted in a third-party data center, users can connect to it and pay for its use as a public service – in proportion to consumption. Customers do not own any licenses to any equipment. They are connected to the application through a public or private network. SaaS makes sense for applications such as payroll, email or sales force automation. But this is not a complete list of applications needed to conduct business. If you like public clouds and if you can find the right solution, use SaaS. But we should not think that this is a complete strategy that satisfies your needs for IT. Very few companies will find a complete SaaS strategy to use IT.

“Platform as a Service” (PaaS): PaaS model means that servers, storage and IDE for a specific client applications reside with a particular vendor. For example, it may be owned by e-commerce platform. Customers write their applications and place them in the provider network, paying for megabytes and CPU. Various models of PaaS are most suitable for specific niche applications. In addition, they can be used to develop and test new software. However, this model is not sustainable and scalable solutions for strategic and other critical corporate applications. In addition, the promised supporters of this model reduce costs in the long term is very doubtful.

“Infrastructure as a service” (IaaS): This is a virtualized infrastructure without the physical, sometimes even without an operating system. You connect to it and do everything that you need. In essence, IaaS is a strategy for placement on another site, where IT assets are virtualized and made available to you according to your needs.

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