DSNT448I STG AVAILABLE ABOVE 2GB = size T

Explanation
  This is the estimated amount
of real storage recommended to support the virtual storage sizes chosen.
  The
amount of real storage needed varies greatly, and you might find that
you need several times more storage than the estimate that is shown.
 This
message is issued by the following CLIST: DSNTINST

System action
  The CLIST continues.

User response
  Compare this recommended value with the actual
available real storage.

Severity
   0 (successful execution)