Initializing the DASD with the DIAG discipline failed.
Possible reasons for this problem are that the device has a device
type other than FBA or ECKD™,
or has a block size other than one of the supported sizes: 512 byte,
1024 byte, 2048 byte, or 4096 byte.
User response
Ensure that the device can be written to and has
a supported device type and block size. For details about the return
code see the section about the INITIALIZE function for DIAGNOSE Code
X'250' in "z/VM® CP Programming
Services". If you cannot resolve the error, note the error code and
contact your support organization.