GRID COMPUTING VS. UTILITY COMPUTING
Utility computing is one of a variety of marketing phrases (others
include autonomous computing, computing-on-demand, adaptive enterprise)
that describe business models for letting customers retrieve computing
resources as necessary. Grid is the underlying technology for all
of those models.
Utility computing is a service provisioning
model in which a service provider makes computing resources and
infrastructure management available to the customer as needed, and
charges them for specific usage rather than a flat rate. Like other
types of on-demand
computing (such as grid
computing), the utility model seeks to maximize the efficient
use of resources and/or minimize associated costs.
The word utility is used to make an analogy to other services,
such as electrical power, that seek to meet fluctuating customer
needs, and charge for the resources based on usage rather than on
a flat-rate basis.
This approach, sometimes known as pay-per-use or metered
services, is becoming increasingly common in enterprise computing
and is sometimes used for the consumer market as well, for Internet
service, Web site access, file
sharing, and other applications.