Operation considerations for dynamic storage reconfiguration

Initial central storage for an LP is allocated on logical storage element 0 and any reserved central is allocated on logical storage element 1.
Whenever a load clear or system reset clear is performed on an LP, it forces the reserved central storage element offline. This allows z/OS® and z/VM to flag the reserved storage element as reconfigurable to allow it to be later deconfigured from the LP. z/VM®The z/VM Dynamic Memory Downgrade, introduced with APAR VM66271 to z/VM 7.2, provides the ability to deconfigure storage while maintaining normal system operation. See the "Host Storage Planning and Administration" chapter in z/VM CP Planning and Administration, SC24-6271.
Note: When z/OS or z/VM is IPLed immediately after the LP is activated, the reserved central storage element is offline.
Whenever z/OS is re-IPLed in an LP that has a reserved central storage element, a load clear or system reset clear followed by load normal should be performed to force the reserved central storage element offline.
When a standalone dump is to be performed on an LP, perform a load normal (not a load clear) on that LP to keep the reserved storage element online and preserve the storage contents.