4.3. I/O errors
I/O errors are most likely caused by a hardware failure or malfunction, and the visible symptom is an abend, accompanied by messages in the SYSLOG that include reason codes, which can identify the type of error; and sense data, which indicates more detailed, hardware-specific information.
I/O errors can also be the result of software conditions that create a situation where subsequent operations will appear as I/O errors. This could be the result of a corruption in a data set, or data set directory, and the rectification process may be as simple as redefining the data set.
Genuine hardware errors generally need to be reviewed by the hardware service representative, and the diagnostic data required to analyze these problems is ...
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