You can use ISMF to define, alter, list, display, back up or recover an aggregate group, or edit the selection or instruction data sets associated with an aggregate group by selecting option 9, Aggregate Group, from the ISMF Primary Option Menu for Storage Administrators. A selection data set is a data set which contains lists of data sets to be included in the backup of an application or other group. An instruction data set is a data set which contains instructions, commands, and so on, that are copied into the control file volume after the backup control file.

Perform the following steps to define storage groups.

1. Select option 9, Aggregate Group, from the ISMF Primary Option Menu for storage administrators. This displays the Aggregate Group Application Selection panel.

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2. Supply values on the Aggregate Group Application Selection panel:

   CDS Name

   This is the name of an SCDS. ISMF primes the CDS Name field with the name last used for an aggregate group. The default is 'Active'. This represents the currently active configuration, but you cannot define or alter aggregate groups to the 'Active' configuration.

   Aggregate Group Name

   This is the name of the aggregate group. ISMF primes the field with the name last used.

   Option

   Select option 3, Define. This displays the Aggregate Group Define panel

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3. Supply values on the Aggregate Group Define panel. You can leave the Aggregate Group Define panel at any time without saving the aggregate group attributes or changes by issuing the Cancel command.
   For more information, see:

   • Defining aggregate group attributes
   • Editing aggregate group attributes