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IBM Systems and Technology GroupUIC Calculation in z/OS 1.8 …•There are three different UIC’s which canbe displayed by the performancemonitors:•Current UIC•Minimum UIC•Maximum UIC•The page replacement algorithm that z/OSuses was enhanced to more efficiently processlarge amounts of real storage.•z/OS 1.8 defines the UIC as a single walkthough the whole storage in seconds.•As a result the UIC values you might see in anRMF report will vary from 0 – 65535 (18 hours),in the past the UIC value range was 0 - 2540.•The higher the UIC value the lesscontention for storage in the system•The lower the UIC value the morecontention for storage in the system. A verylow UIC indicates that the system is storageconstrained.21 z/OS RMF – The Latest and Greatest© 2003 IBM Corporation