Grid computing is often confused with cluster computing. The key difference is that a cluster is a single set of nodes sitting in one location, while a Grid is composed of many clusters and other kinds of resources (e.g. networks, storage facilities).
Definitions
The term Grid computing originated in the early 1990s as a metaphor for making computer power as easy to access as an electric power grid.
Today there are many definitions of Grid computing:
- The definitive definition of a Grid is provided by Ian Foster in his article "What is the Grid? A Three Point Checklist"[2] The three points of this checklist are:
- Computing resources are not administered centrally.
- Open standards are used.
- Non-trivial quality of service is achieved.
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