" Not really. In order to get that famous 99.999% availability with a rock-solid SLA you need to run a data-sharing parallel sysplex -and- you need to leave some whitespace on each image so there is "room" to accommodate workload shifts for planned and unplanned system/application outages. " You are wrong here. z/OS workloads usually include discretionary work that uses any idle CPU, but can be delayed when the CPU is needed for more productive work. Just because a system is 100% busy doesn't mean that it cannot take on additional work.
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