Cloud Computing - Types of Cloud

Cloud computing has several delivery models. These differ according to the openness of the platform. A distinction is made between public, private and hybrid clouds.

Public Cloud
The public cloud is available for a variety of companies.
The customer gets „unlimited“ access to resources such as computing power, storage devices and software applications.
The data management is customer-oriented and each user receives only access to its user data.

Hybrid Cloud
In the hybrid cloud two or more clouds (like private and public) are combined.
Every cloud works independently.
The networking within the cloud works via a so-called middleware, which enables the exchange of data.

Private Cloud
The private cloud is operated for a company and onto the company´s own network.
The applications / hardware are designed mainly for its own employees.

Formen der Cloud

Based on: Köhler-Schute, Christiana 2011, p. 40
cf. Metzger, Christian; Reitz, Thorsten; Villar, Juan 2011, p. 34


Public Cloud:


- „Unlimited“ scalability
- Use of economics of scale
- High flexibility
- Multi tendency
- Shorter contract periods
- Faster implementation times
- Pay-per-use 


- Higher risk for data security (depending on the security policy)
- Possible loss of IT expertise


Hybrid Cloud:


- advantages of two cloud delivery models
- Integration of existing software systems
- Supplement of local software solutions


- Higher complexity and more vulnerable for errors
- Compatibility issues


Private Cloud:


- Local data storage
- Highly customizable solution
- Compliance IT governance
- Private enterprise network
- Usage of internal scale effect


- Higher IT costs
- Limited pooling of IT resources
- Dependence on IT infrastructure