The essence of the matter is to ensure that the selected configuration meets the availability objectives of the business services supported by the sysplex. One must consider the service restoration objectives for the business services in light of the potential failures that can occur for a potential choice of configuration. There are many possibilities and different installations will of course make different choices based on their own business objectives. Choices of standalone CF, or structure duplexing, and the like are really all talking about different ways of solving the "failure isolation" issue (wherein we might be concerned about the time to restore the business service if we simultaneously lose the data in the CF along with the system that produced that data). Each choice has its own advantages and disadvantages; choose the one that's right for you. --Mark Brooks --z/OS Sysplex Development
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