Cloud computing is not new a technology, a new architecture or a new method. As I mentioned in a previous post: Cloud Computing is a new business model for providing IT. It is like the difference between
– Build a house
– Rent a house.
In the first case, you should use an architect for plans, but also appeal to various people for construction. Above all, you must pay the investment. By building your own home, you can choose just about everything in detail. In the second case, the lease, no investment to predict. You rent a house based on what the market offers. It may, in some ways, not be as you wish. Your family is growing? If you chose the first option, construction, you may either expand or sell or be cramped! Rental, you’re more free.You can choose a bigger house but also revert to a smaller if necessary.
What is the parallel with Cloud Computing?
The business model for providing IT now, is to build. You buy servers, you buy softwares and all IT Teams are present to build the appropriate solution. This mobilizes capital (Capex) related to investments. In the Cloud’s model, this is innovation, investments are paid by the Vendor which is offering the service with a rental payment for use. The issues of capacity and adjustment are no longer your responsibility, the supplier shall include in its offer.
An example: the e-mail.
Google and Microsoft offer a e-mail service with a payment based on the number of users per year. Need to add 500 users? to remove 1000? The supplier adjusts the capacity and costs.
Come back on definitions
John Rothon defines cloud computing: “Cloud Computing Introduces off premise, elasticity, flexible billing, virtualization, service delivery, universal access, simplified management, affordable resources, multi-tenancy, service level management.”
CRIP – Club Responsable d’Infrastructure et de Production said in its latest White Paper: “Cloud computing is to access the application via the Internet (or intranet), virtualized computing resources, pooled and shared, easy to use, and pay to use via a subscription. ”
Cloud services are classified into three categories and two types for distribution.
– The category is the type of service, much like the house with the range of options (paint, wallpaper).
– The distribution type is to know whether you are a partner in a program as part of a subdivision or a project dedicated to building a house just for you.
The categories are:
– SaaS – Software as a Service. The use of a leased software from a third party. The pioneer in this area is Salesforce.com, which offers CRM – Customer Relationship Management or Google Gmail for email.
– PaaS – Platform as a Service. Service of a complete environment for the development and application execution from a supplier. PaaS mature services are newer include Google App Engine, Microsoft Azure or Heroku.
– IaaS – Infrastructure as a Service. Available in pay per use method to have a server with all the hardware, but also system, storage and network connection. The IaaS can also provide virtualized workstation. Amazon Web Services (AWS) is the leader in this field.
Distribution methods are:
– Public Cloud – As its name suggests, it is public because anyone can join. The public side indicates that the services are offered to the public. In any case your items in the Cloud Public will not find on the Internet at all! Is your email Gmail visible to all? The elements of your customer contacts in Salesforce are they shared or visible without borders? Obviously not. The Cloud offers a pooling of public resources to enable economies of scale.
– Private Cloud – The Private Cloud is a space that is only offered for one and only one client. The service is performed either from a dedicated space within a supplier, either in the premises of the company itself.
For some purposes, it is possible to combine these two modes. The Hybrid Cloud are built to combine Public and Private for certain functions (eg supercomputing), the Cloud Community are, in fact, a Private Cloud shared between several companies.
The cost model of Cloud Computing:
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