Event Log Header Recovery Without System Shutdown
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Solution Overview
Problem
Corruption in the header of event logs renders them unreadable, hindering error diagnosis in system failures, and existing methods require reinitialization or shutdown to recover logs.
Innovation Solution
A method to detect and recover corrupted pointers and the eye catcher in the log buffer header without shutting down the memory, allowing for the reconstruction of the event log header and presentation of non-corrupt entries to a management console.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the log buffer header is corrupted, then the event log becomes unreadable and cannot be used for debugging, but reinitializing memory to recover the log causes system shutdown and loss of operational continuity
Solution Approach 1:
The patent segments the log buffer into multiple regions: a header region containing pointers and metadata, and a data region containing actual log entries. By segmenting the corruption detection and recovery process into separate steps (detecting header corruption, attempting pointer recovery, validating eye catcher), the system can recover from header corruption without losing the segmented data region, thus maintaining system uptime while restoring log readability.
Solution Approach 2:
The patent implements preliminary validation mechanisms including eye catcher validation and pointer integrity checks before fully trusting the log buffer header. When corruption is detected, preliminary recovery actions are taken first (attempting to reconstruct pointers from valid data), and only if these fail does the system proceed to more drastic measures. This preliminary action approach allows recovery without system shutdown in many cases.
2Difficulty of detecting and measuring
If corruption detection is performed on the log buffer header, then corrupted pointers can be identified, but the system cannot determine whether the corruption is in the start pointer, end pointer, or eye catcher without separate detection steps
Solution Approach 1:
The patent divides corruption detection into three separate detection steps, each targeting a specific component: start pointer validation, end pointer validation, and eye catcher validation. This segmentation allows the system to identify exactly which component is corrupted without requiring complex analysis of the entire header at once, reducing the difficulty of detection while maintaining manageable complexity through modular validation routines.
Solution Approach 2:
The patent uses an eye catcher as an intermediary validation marker that simplifies corruption detection. The eye catcher is a known good value that should appear at specific locations in the log buffer. By using this intermediary marker, the system can quickly validate whether the log buffer structure is intact without needing to analyze every byte of the header, reducing detection complexity while improving reliability.
Data Source
AI summary
An approach for recovering event logs. The approach detects corruption in an event log. The approach determines whether a start pointer in a log buffer header is corrupt. Responsive to a determination that the start pointer is corrupt, the approach recovers the start pointer. The approach determines whether an end pointer in the log buffer header is corrupt. Responsive to a determination that the end pointer is corrupt, the approach recovers the end pointer. The approach determines whether an eye catcher in the log buffer header is corrupt. Responsive to a determination that the eye catcher is corrupt, the approach recovers the eye catcher. The approach presents one or more log entries to a management console.