IBM Z9, Planning Manual

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If the operating system running in the LP supports physical storage reconfiguration,
use operating system commands to make the reserved storage available to the LP
without disrupting operating system activities.
For z/OS, use the following command format to reconfigure central storage:
CF STOR(E=1),<OFFLINE/ONLINE>
Dynamic storage reconfiguration on the System z9 for central storage enables
central storage to be reassigned between LPs that have noncontiguous address
ranges. In this case, LPAR can allocate a “hole” or some set of central storage
addresses for which there is no backing physical storage assigned. Later, LPAR is
able to configure storage online to the LP by assigning some physical central
storage to the hole.
Similarly, dynamic storage reconfiguration for expanded storage enables expanded
storage to be reassigned between LPs that have noncontiguous expanded storage
address ranges.
For central storage, you can reconfigure central storage in amounts equal to the
storage granularity supported by the CPC. For z/OS, use the following command
format:
CONFIG STOR(nnM),<OFFLINE/ONLINE>
Chapter 3. Determining the Characteristics of Logical Partitions
3-13