DW request_number : UCBLOOK error for device device_type. RC=return_code RSN=reason_code.
The data writer assigned to request request_number detected a UCBLOOK error while analyzing a data set from the sampled region. device_type is the UCB device type, return_code and reason_code are the return and reason codes respectively from UCBLOOK.
None. Sampling continues, but the user might notice missing data when viewing the DASD reports.
Refer to the MVS™ Programming: Authorized Assembler Services Reference for information about the UCBLOOK return and reason codes. Correct the problem and resubmit the sample request.