26 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 A.M. to 5:30 P.M., Monday through Friday) by capturing orders, cash withdrawals, or 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.
Although we still see this model in some organizations, in recent years there has been a significant change in the way that most companies carry out their business, driven ...
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