Acquiring a data space

IMS acquires data spaces for VSO areas when the VSO areas first open, but not before.

The maximum size of any VSO area data space is two gigabytes. Data spaces for preloaded VSO areas use the z/OS® DREF (disabled reference) option. Data spaces for non-preloaded VSO areas do not use the DREF option.

DREF data spaces use central storage, but no auxiliary storage. Data spaces without the DREF option use central storage and auxiliary storage, if auxiliary storage is available.

IMS acquires additional data spaces for VSO areas, both with DREF and without, as needed.