2. PERFORMANCE REPORTING ANALYSIS › 2.5 Virtual Storage Management Analysis

2.5 Virtual Storage Management Analysis

This section introduces virtual storage concepts to form a
background for discussing the management of virtual storage
in MVS/XA and MVS/ESA.  The composition of MVS virtual
storage is described, with the goal of defining the methods
that MVS uses to manage virtual storage and the measurements
available for analyzing it.

Virtual storage control is explained for MVS/XA only, because
RMF does not provide any measurement of virtual storage for
MVS/370.

The Virtual Storage Management Analysis inquiries enable you
to track the use of virtual storage by MVS/XA at any
supported time-span and summarization pattern.  Reports and
plots display system measurements of virtual storage
allocation.  More detailed reports of Common Area storage
usage are also available, including allocation information
within storage subpools and protection keys.  In addition to
system level and Common Area reporting, you can display
virtual storage resource distribution patterns using either
plots or reports for any Private Area being measured by RMF.

Section 2.5.4, Virtual Storage Concepts in MVS/XA, defines
the terms, explains the basic dynamics of many of the
elements used in virtual storage analysis, and describes the
types of virtual storage measurements provided by RMF.
Depending on your familiarity with these terms and concepts,
you may find it useful to read this section before proceeding
with Sections 2.5.2 and 2.5.3.

The following sections describe the operation of the Virtual
Storage Management Analysis inquiries and how to use the
reports that are produced:

    1 - Functional Description
    2 - Usage Guidelines
    3 - Standard Output
    4 - Virtual Storage Concepts in MVS/XA
    5 - Case Study
    6 - Component Operation
    7 - Requirements