System Types—Availability Requirements
High availability is often associated with fault-tolerant systems. The term fault-tolerant means a system can operate while experiencing hardware component failures. A single component failure in a fault-tolerant system will not cause a system interruption because an alternate component will take over the task transparently.
As the cost of components continues to decrease, and demand for system availability increases, many non-fault-tolerant systems have redundancy built-in at the subsystem level. As a result, many non-fault-tolerant systems can tolerate hardware faults—consequently, the line between a fault-tolerant system and a non-fault-tolerant system is becoming increasingly blurred.
A service level ...
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