Defining the base configuration

Before you begin: You must allocate an SCDS.

Perform the following steps to define a base configuration.

Select option 8, Control Data Set, from the ISMF Primary Option Menu for Storage Administrator. This displays the CDS Application Selection panel.
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Supply values on the CDS Application Selection panel:
CDS name

This is the name of the SCDS that is to contain the base configuration. ISMF primes the CDS Name field with the last used SCDS name

Option
Select option 2, Define. This displays the SCDS Base Define panel.
You can also:
- See the base configuration, by selecting option 1, Display. You can use this option to look at the base configuration of the current active SMS configuration by specifying 'ACTIVE' in the CDS Name field.
- Alter an SCDS base configuration that you defined previously, by selecting option 3, Alter. The Alter panel contains the same fields as the Define panel.
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Supply values on the SCDS Base Define panel.
Use the DOWN command to view the second page of the panel.

Description

You can use the field to help you identify and describe the SCDS. Your description can be up to 120 characters.

Default Management Class

See Specifying the default management class.

Default Unit

See Specifying the default unit.

Default Device Geometry

See Specifying the default device geometry.

DS Separation Profile (Data Set Name)

See Specifying the DS separation profile.

Systems and System Groups in the SMS Complex

See Specifying systems and system groups in the SMS complex.

If at any time you want to leave either the SCDS Base Define panel without saving the changed base configuration information, issue the CANCEL command.

When you have supplied all of the values, use the END command to save them and return to the CDS Application Selection panel.

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Validate and activate the SCDS, as desired. See Validating the SCDS and Activating the SCDS.
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Requirements and Restrictions:

The SMS configuration supports up to 32 system names, system group names, or both. When the system is running in compatibility mode (8-name mode) you can specify a maximum of eight system names, system group names or both in the SMS configuration. When the system is running in 32-name mode, you can specify a maximum of 32 system, system group names or both.
The current system mode is defined in the IGDSMSxx member of SYS1.PARMLIB, specified when SMS is started (see Preparing for the Storage Management Subsystem). If SMS is not active, the number of systems you can put in the SCDS is determined by the SCDS itself. If it is an 8-name configuration, you can only put eight names in it. If it is a 32-name configuration, you can put up to 32 names in it. If it is an empty data set, it defaults to 8-name mode.
When you access an SMS control data set (SCDS, ACDS, or COMMDS) for update which supports only eight names on a system running in 32-name mode, the data set must be converted to a new, incompatible format in order to support 32 names. You must confirm this conversion, either through the operator console or ISMF. This conversion is permanent, so you should make copies of your control data sets before converting the system mode from compatibility mode to 32-name mode.