The use of data spaces consumes system resources such as virtual, processor, and auxiliary storage. Programmers responsible for tuning and maintaining MVS™ can control the use of these resources. Through the system management facility (SMF) installation exit IEFUSI, an installation can set limits on the amount of virtual storage that programs in each address space can use for data spaces and hiperspaces.

For information on using IEFUSI, see z/OS MVS Installation Exits.