55
access the same master data for policies, rules, audit logs, etc. and
are stored in an enterprise‐wide, standardised Change and
Configuration Management Database CCMDB
18
.
Benefits:
The Hybrid Cloud offers a combination of the flexibility of a public
Cloud with the reliability and security of a Private Cloud. This puts
enterprises in a position where they can be provided with the
elastically and dynamically to required system load states, while at
the same time maintaining control over all critical areas. A hybrid
solution is a very pragmatic transition from traditional landscapes to
new Cloud services that that reflects the current enterprise situation.
It also supports a variety of data storage models.
Disadvantages:
As mentioned previously, the more complex the solution becomes,
the bigger a challenge it is in terms of service management,
especially Identity Management. End users are typically prepared to
use various services with different usernames and passwords in
private use (Gmail, Twitter, Facebook, iTunes, etc.). However often
the same user will not want to manage more than one identity for
business use.
3.1.5
Special deployment model types
By categorising Cloud models this help us emphasise differences and more
easily understand the world of Cloud computing.
19
Regional Clouds
Because the Internet is a global network of network Cloud services can also
be provided globally using the Internet. But this is not mandatory; in many
cases it makes sense to establish Cloud resource services with geographical
limits. They are then referred to as “Regional Clouds“.
Regional Clouds aim to provide special services for citizens, employees and
visitors of a specific region, or country. The breadth of services offered here
is huge; it starts with information and reservation systems for the local
transport authority, touristic services such as virtual, audio and video
supported city guides, to car‐sharing services to healthcare. Regional service
18
Change and Configuration Management Database
19
An expanded version of this chapter can be found under
