extmem.326775 DCSS <DCSS name> overlaps with used memory resources and cannot be reloaded
Explanation
The DCSS has been unloaded and cannot be reloaded because it overlaps with
another loaded DCSS or with the memory of the z/VM guest virtual machine
(guest storage).
User response
Ensure that no DCSS is loaded that has overlapping memory resources
with the DCSS you want to reload. If the DCSS overlaps with guest storage,
use the DEF STORE CONFIG z/VM CP command to create a sufficient storage gap
for the DCSS. For details, see the section about the DCSS device driver in
"Device Drivers, Features, and Commands".