27. The Availability and Resilience Perspective
In the traditional data processing model of system availability, computers supported the mainstream business of the organization during the day (typically 9:00 A.M. to 5:30 P.M., Monday through Friday) by capturing orders, cash withdrawals, and other sorts of transactions. Then the computers reverted to batch mode during the night to perform tasks such as reconciliation, consolidation, and exchange of information with other systems.
In contrast, companies today routinely run their business on a global basis. This has caused the business day to become longer, often extending into the weekend (the ...
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