One frame equals four kilobytes - the same size as a page or slot. In IBM's z/OS, active z/OS program parts are placed and run in central storage frames, whereas inactive programs are placed in auxiliary slots. However, all program parts - whether active or inactive - have virtual storage addresses in virtual pages.
Virtual, auxiliary and real storage managers use z/OS frames to rotate instructions and executable data. During a page-out or page-in operation, an auxiliary storage manager works with a real storage manager to locate the correct central storage frames and auxiliary storage slots to store and read parts of program executables.
The z/OS manages storage using the following units, which are each 4 KB in size:
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