Managing the Globally Distributed Data Centre

"The next-generation data centre is not just a physical structure, but a global, managed ecosystem with the capacity to share resources within and beyond physical boundaries." (IBM) The data centre which an information system department may be using may not be physically in one place, but consists of services scattered across the world, or at least located in several globally distributed data centres.

Question:

Data Centres: Using an example, explain how a globally distributed data centre works. How does it differ from a traditional data centre? Why should a company use global distributed data centres? What are the advantages? What are the problems? Unpack the following and explain what it means: "One of the challenges of building and deploying a dynamic application environment and cloud architecture models such as cloud bursting-is managing access to applications and services running with the clouds as they move from place to place." What are the security, privacy, resilience and cultural issues associated with this?