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Private, public or hybrid cloud?

Depending on the needs, the historical infrastructure and the size of a company, three kinds of the cloud computing service can be provided: private cloud, public cloud and hybrid cloud.

 

Private cloud...

means an internal, company owned IT structure, which provides IT services to the given number of users, secured by a common firewall.            Progress in virtualization and scattered computers enabled  net and data bases administrators in the biggest corporations effectively become services providers, fulfilling expectations of IT users inside organization.           

Unlike public cloud, the private one is a self-owned net with data base using the cloud computing technologies, such as virtualization and also unlike the public one it requires full IT infrastructure capital investing.  

The private cloud is managed internally by the owner.  

It was forecasted that private clouds would be the future of IT for all companies. But what about the cost efficiency of small and medium size companies? Creating private clouds involves capital investments (buying hardware and software), creating (company level virtualization, data center) and managing IT infrastructure (IT specialists employing). For companies, which can not bear high entering costs for IT infrastructure, private cloud does not seem to be the best solution.      

 

Public cloud...

is an external cloud, which means cloud computing in its base form. External clouds base on the standard model of cloud computing and it is the provider who creates resources and takes care of its maintaining and keeping security. The service is available for external users via internet. The public cloud services might be for free or users pay fees for each use.   The main advantages on using public cloud are:       

- simple and inexpensive installation, as all costs of purchasing hardware, applications and performance are covered by service provider;       

- scalability;       

- no infrastructure over-investing because users pay only for the applications they use;  

The name ‘cloud computing’ was created for differentiation between the standard model of cloud computing and private cloud, using its own resources and only supporting its performance with public cloud.      

 

Hybrid cloud...

is a combination of the two models: the services of an effective external cloud and the company’s own net. This is the cloud computing environment where companies manage their own resources and other services are purchased form an external provider. In practice, such combination may mean that a company is using a public cloud but still keeps its data (e.g. clients data) in an in-house own base.           

While cloud computing is expected to be the future of enterprises, it is the hybrid model, to be the most popular. Big enterprises had already made investments in IT infrastructure to manage their own resources. Many of them for security reasons prefer to keep special data under their own control. By integrating different cloud services, the hybrid cloud users may easily move between their own resources and the public cloud services without the access authorization each time.           

Hybrid cloud is managed by the in-house and the external provider within their competences.