Donald R. Deese

   Expanded storage is offered as a relatively inexpensive way of using
   high speed processor storage to minimize I/O operations.  Under many
   circumstances, expanded storage achieves this objective.  In some
   situations, the expanded storage algorithms may not yield the expected
   benefits.  In a few situations, expanded storage can cause severe
   performance problems.  This paper describes the concepts and algorithms
   used to manage expanded storage with MVS/ESA and highlights major
   changes between MVS/XA and different releases of MVS/ESA.

WARNING: None of the concepts apply with z/architecture since expanded storage does not exist with z/series processors operating in ESAME mode.

Download paper (pdf format).


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Last updated by Don Deese on 12/04/02.