Were you burned over the years by recommended capacity controls, such as hard capping or memory fencing? If you’re a long-time mainframe capacity planner, you quite possibly experienced the cost of implementing such ‘recommendations’—getting paged as key workloads were throttled and performance suffered. As IBM gets practical feedback from the field, it continues to offer better and better iterations of the tuning concept. Once an idea has been well field-tested and enhanced, it’s a good idea to take another look at it. Such is the case with soft-capping.
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