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mission-critical network planning
A decade ago, a book on network continuity would have presented a different light
on survivability and performance for information technology (IT) environments.
Although enterprises possessed and operated their own IT infrastructure, end users
were typically internal to the company. The advent of the Internet as an enabler for
electronic commerce (e-commerce) eventually forced IT departments to take a
somewhat different stand regarding their operating environments. IT environments
now have greater exposure and interaction with entities and users external to the
enterprise. Heavy reliance on the Internet and distributed processing has created an
environment that is more susceptible to forces outside the company. Consequently,
customer expectations regarding survivability and performance have risen far
beyond the tolerances of the internal user. Processing availability and speed have
become new requirements for competition. After all, there is not much an internal
user can do when service is problematic except complain or file a trouble ticket.
Customers, on the other hand, can take their business elsewhere.
As systems become increasingly distributed, cheaper, and innovative, greater
focus has been placed on strategically arranging them using effective network design
practices to ensure survivability and performance. Strategies and practices used in
the past to deliver survivable and well-performing networks are being revised in
light of more recent IT trends and world events. The practice of purchasing faulttolerant
hardware as a sole means of achieving service availability is no longer
sound. The practice of simply backing up and restoring data can no longer ensure
the tight recovery intervals required for continuous processing. A recent trend
towards consolidating many operation centers into larger, more efficient centers is
being revisited in light of recent threats to national security.
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