Mainframe performance management: Linux adds complexity?
What is mainframe performance management? In the past, neither mainframers nor non-IBM IT types would have had any difficulty in answering that question: mainframe performance management is that part of application and system management that focuses on performance, not RAS (reliability, availability, serviceability). However, they would have had great difficulty explaining to the CEO or CFO why he or she should worry about it. This is because performance management in general, and mainframe performance management in particular, has historically been an after-thought, a "nice to have" that always took a distant second place to making sure that the systems were up and running.
Note: the idea of performance management is a bit fuzzy to some users. Especially in the age of virtualization, performance management is not about optimizing the performance of each application; instead, it is about ensuring worst-case performance of all applications that meets a service-level agreement – say, a five-second response time for any end user at peak load.
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