Using data set separation with generation data groups and striping

Data set striping can use multiple controllers when multistriped. When using data set separation on the PCU level that references multistriped data sets, ensure that the storage group ACS routines select storage groups that contain a sufficient number of PCUs.

Generation data groups (GDGs) that are listed in the data set separation profile must specify the absolute generation and version number (for example, A.B.C.G0001V00). Data set separation does not support relative generation numbers and GDS base names.

When specifying separation of GDGs on the PCU level, ensure that the number of generations that reside on pool volumes does not exceed the number of available PCUs.

Recommendation: Migrate older GDG generations to allow a sufficient number of PCUs for the non-migrated GDG generations.

For more information about GDGs, refer to the discussion of GDG Management Attributes inDefining management class migration attributes. For more information about data set striping, refer to Striping volume selection.