Chapter 14. Performance and High-Availability Issues
“Failure is not an option.”
—Gene Krantz, Apollo 13 Flight Director, at LotuSphere '99, in Orlando, Florida
Almost every company needs to have high performance and high availability for their Web servers. However, there are many different aspects of high availability. At one time, the only avenue for achieving high availability in the UNIX realm was through fault-tolerant technology. Fault tolerance relies on specialized hardware to detect a hardware fault and instantaneously switch to a redundant hardware component—whether the failed component is a processor, memory board, power supply, I/O subsystem, or storage subsystem. Although this cut-over is apparently seamless and offers nonstop service, ...
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