1. OVERVIEW › 1.2 MVS Behavior Tracking and Analysis

1.2 MVS Behavior Tracking and Analysis

The CA MICS Performance Manager Option includes tutorials and
reports for tracking MVS by analyzing data about the System
Resource Manager (SRM), Real Storage Manager (RSM), Virtual
Storage Manager (VSM), and the Auxiliary Storage Manager
(ASM).  This is described briefly in this section and more
fully in Sections  2.2, and 2.3.  Additionally, with the
introduction of MVS/ESA SP 5.1 and Parallel Sysplexes, the
Performance Manager incorporates reports for analyzing data
about the functioning of Sysplex configurations (SPA).
Section 2.8 describes these reports in more detail.

The Installation Performance Specifications (IPS) control the
SRM, which is a component of the MVS control program.  The
SRM controls the distribution of system resources (CPU, I/O,
and real storage) by controlling the amount of time each
address space is allowed to execute.  SRM's objective is to
achieve optimal use of system throughput.  Details on IPS
analysis are no longer provided in this guide.

In controlling these resources, the SRM must interface with
the other major MVS components, including RSM, VSM, and ASM.

RSM maintains the control blocks that translate real and
virtual storage addresses, makes the determination of working
set contents when an address space is swapped, and performs
the page replacement operations.  RSM analysis is discussed
in detail in Section 2.2.

ASM manages the page and swap data sets that comprise the
virtual space.  The page data sets provide the auxiliary
storage that backs up the storage frames.  Section 2.3
describes the operation of ASM, detailing its real storage
control mechanisms and their relation to the other system
components.  It also discusses the algorithms controlling the
allocation of the auxiliary storage devices and provides
guidelines for tuning an ASM configuration.

MVS/ESA SP 5.1 provides support for the System 390 Parallel
Sysplex, which consists of hardware, software, and optional
services.  The Parallel Sysplex supports full data sharing
among the processors in the sysplex and dynamic workload
balancing across the system.  Section 2.8 describes the
operation of a sysplex, including use of the Coupling
Facility, which provides the means for multisystem data
sharing by authorized subsystems in a Parallel Sysplex.  It
also discusses the analysis features of the CA MICS MVS
Performance Manager that assist in managing and tuning a
sysplex environment.