Chapter 5. Storage Management with DFSMS

This chapter is designed to familiarize the DB2 administrator with the functionality of SMS. This chapter covers the following topics:

The SMS base configuration

The automatic class selection routine

The SMS constructs

Objectives of using SMS with a DB2 system

How SMS can handle DB2 special data

Further information can be found in the following publications:

DFSMS/MVS V1R4 Implementing System-Managed Storage, SC26-3123

MVS/ESA SML: Managing Data, SC26-3124

MVS/ESA SML: Managing Storage Groups, SC26-3125

5.1 Introduction

SMS manages an installation’s data and storage requirements according to the storage management policy in use. Using ISMF, the storage administrator defines an installation’s storage management policy in an SMS configuration, which consists of:

The base configuration

Class and Storage Group definitions

5.1.1Base Configuration

The base configuration contains defaults and identifies the systems which are

SMS managed. The information is stored in SMS control data sets, which are

VSAM linear data sets. These consist of:

Source control data set (SCDS)

Active control data set (ACDS)

Communications data set (COMMDS)

Source Control Data Set

The source control data set (SCDS) contains the information that defines a single storage management policy, called an SMS configuration. More than one SCDS can be defined, but only one can be used to activate a configuration at any given time.

Active Control Data Set

The active control data set (ACDS) contains the SCDS that has been activated to control the storage management policy for the installation. When a configuration is activated, SMS copies the existing configuration from the specified SCDS into the ACDS. While SMS uses the ACDS, the storage administrator can continue to create copies of the ACDS, modify, and define a new SCDS if desired.

© Copyright IBM Corp. 1999

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IBM 5695-DF1, 5655-DB2 manual Storage Management with Dfsms, Introduction, Base Configuration, Source Control Data Set

5695-DF1, 5655-DB2 specifications

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