2. PERFORMANCE REPORTING ANALYSIS › 2.2 Real Storage Management Analysis › 2.2.4 MVS Concepts › 2.2.4.4 Expanded Storage Concepts

2.2.4.4 Expanded Storage Concepts

This section introduces concepts common to expanded storage.
Originally, this was a high-speed semiconductor memory,
initially made available for the IBM 3090 processor series.
In later systems, this became a redefinition of central
storage performed during IPL.  It was provided to maintain
compatability with existing applications.  Additionally, with
WLM Goal mode, many of the metrics discussed in the following
sections and the control mechanisms used were eliminated. The
information is presented here in a historical context only,
and is no longer used for managing system performance.

The following sections discuss expanded storage and its
impact on the job of Real Storage Management.

    1 - Overview of Expanded Storage
    2 - System Control of Expanded Storage
    3 - Users of Expanded Storage
    4 - Measurement, Analysis, and Management