extmem.262f7b Loading or querying DCSS <DCSS name> resulted in a hardware error
Explanation
Either the z/VM DIAGNOSE X'64' query or load call issued for the DCSS
returned with an error.
User response
Look for previous extmem message to find the return code from the
DIAGNOSE X'64' query or load call. For details about the return codes see
the section about DIAGNOSE Code X'64' in "z/VM CP Programming Services".