I/O Error Diagnostics via Re-drive and Capture
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Solution Overview
Problem
In the z/OS operating system, I/O errors often result in stale diagnostic data due to reused control blocks, making it difficult to determine the root cause of I/O errors, as diagnostic tools are typically disabled for normal operations to reduce overhead and may not capture data the first time an error occurs.
Innovation Solution
A method that detects I/O errors, determines if they can be re-driven, enables diagnostic functions, and immediately re-drives the I/O operation to recreate the error, allowing for the capture of diagnostic information using an information collection module that includes sub-modules for error detection, re-drive determination, diagnostic enablement, and data capture.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If diagnostic tools are enabled during normal operations to collect trace data, then diagnostic information can be captured, but system overhead increases
Solution Approach 1:
The system performs preliminary actions by capturing diagnostic information immediately when an I/O error occurs, before the control block is reused and data becomes stale. The error recovery routine is triggered automatically at the moment of error detection, ensuring diagnostic data is collected while still valid without requiring continuous diagnostic tool activation during normal operations.
2Productivity
If diagnostic tools are disabled during normal operations to reduce overhead, then system performance is maintained, but diagnostic information cannot be collected the first time an error occurs
Solution Approach 1:
The system implements feedback by automatically detecting I/O errors and triggering the error recovery routine in response to the error condition. When an error is detected, the system enables diagnostic functions and recaptures the error, creating a feedback loop that ensures diagnostic information is collected without requiring continuous diagnostic tool activation during normal performance operations.
3Loss of information
If the I/O operation is re-driven to recreate the error, then diagnostic information can be captured, but additional time is required
Solution Approach 1:
The system performs self-service by automatically detecting I/O errors and initiating the error recovery routine without external intervention. The error recovery routine autonomously enables diagnostic functions, recaptures the error condition, and collects diagnostic information, eliminating the need for manual user intervention to recreate errors and reducing overall time loss.
Data Source
AI summary
A method for collecting diagnostic information associated with an I/O error is disclosed. In one embodiment, such a method includes detecting an error associated with an input/output (I/O) operation. The method determines whether the error can be re-driven and, if so, enables various diagnostic functions to improve collection of diagnostic information. The method then immediately re-drives the I/O operation associated with the error in order to recreate the error. Using the diagnostic functions that have been enabled, the method captures diagnostic information associated with the recreated error. A corresponding system and computer program product are also disclosed.