Chapter 4. Increasing availability and scalability 81
The e-business application
Consisting of the HTTP Web servers and the applications running on those
servers
Basically we have to consider two different approaches, as outlined by the CIO:
Availability
Allowing systems to be available on a 24x7 schedule by providing enough
resources in additional, duplicated systems or other fail-over mechanisms.
Scalability
Allowing the e-business solution to scale to any number of future capacities
by adding additional components of the same sort and providing smart load
balancing mechanisms to perfectly utilize these new components. In a second
viewpoint, this can also imply moving a current functional implementation to a
new, more powerful operating ...