52
The below services are defined in greater depth in section 3.1.6, but for now
illustrate the benefits of Public Cloud.
Benefits of this model shown:
Public Cloud IaaS (Infrastructure as a Service)
:
An ideal scenario for
enterprises that do not want to invest in their own IT infrastructure
and also want to save costs. This means, that upfront investments
can be avoided, and capital expenditures are converted into
operating costs.
Public Cloud PaaS (Platform as a Service)
:
An entire delivery
platform is hosted in the public, thus reducing operational costs
further. The customer must take care for databases or webservers.
Public Cloud SaaS (Software as a Service)
:
The application (service)
itself is bought in and then brokered by the local IT. Costs are
reduced further and the model is extremely flexible and elastic in
terms of resources and users.
Public Cloud DaaS (Desktop as a Service)
:
An enterprise can
purchase a complete workplace (desktop) in the Cloud. Users can
access applications, content and services on any typical terminal
device. In particular, the aspect of mobility plays an increasingly
important role in the planning of many enterprises as this model
more or less automatically allows access to enterprise applications
independently of location.
Disadvantages of Public Cloud model:
Little customisation capabilities of the service
The consumer replaces the previous (absolute) control over its own
IT by a contractually agreed set of rules; in case of dispute,
compliance with and fulfillment of these rules needs to be asserted
in a court of law. This means additional risks in many respects; above
all, the time dimension of asserting a legal claim needs to be taken
into account.
There are also risks relating to compliance, security, availability, and
performance that need to be investigated in detail for each
individual case.
