Hardware fails. Period. In a high-availability system a hardware failure is NOT a disaster, it's an expected event that will be automatically handled.
Disasters are events like hurricanes and earthquakes knocking out both the main power and the backup generators.
But you're right. I'm assuming that a security system at a major international airport should be on the same availability level of, say, and ERP system at a major company. Determining availability requirements, especially for non-line-of-business systems, is hard.
Discussion on:
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