Summary

Making technology decisions for high availability is not easy. Remember these two words and apply them to your environment: it depends . What works for one company or one solution might not be appropriate for another; there are no absolutes. Consider what each technology brings to the table in terms of strengths and weaknesses, and then match those against your needscost, application, administration, and so on. If possible, as an insurance policy, choose more than one method of high availability. For a complete example of designing a solution that includes cost, hardware, and technology choices, see Chapter 10.