Teamed NIC Error Recovery Logic
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Solution Overview
Problem
Teamed network interface cards (NICs) in information handling systems typically fail to continue operating due to uncorrectable PCI express bus errors, leading to system shutdowns, as traditional error handling considers such errors catastrophic.
Innovation Solution
A method and system for detecting uncorrectable errors in NICs, determining if the error is isolated to a specific NIC and if it is teamed with others, and notifying the operating system of successful recovery, allowing the system to continue operating with reduced performance using hardware error handling systems and logic instructions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional PCI bus error handling is used, then system stability is maintained by shutting down on errors, but system availability deteriorates due to unnecessary system halts on non-fatal errors
Solution Approach 1:
The patent segments the error handling process into multiple levels: PCI bus error detection, error source identification (NIC-specific vs. system-wide), and conditional response selection. This segmentation allows the system to differentiate between fatal and non-fatal errors, applying appropriate handling strategies to each segment of the error spectrum.
Solution Approach 2:
The patent changes the error handling parameter from a binary shutdown/not-shutdown decision to a multi-state response system that includes continued operation, graceful degradation, and selective NIC isolation. This parameter transformation enables more nuanced error management that preserves system availability while maintaining stability.
2Reliability
If teamed NIC configuration is used, then redundancy is improved against hardware failures, but vulnerability increases to uncorrectable bus errors that cause system-wide shutdowns
Solution Approach 1:
The patent introduces an intermediary error handling layer between the PCI bus error detection and the operating system that acts as a mediator. This intermediary analyzes error characteristics, determines isolation scope, and selectively applies recovery actions, preventing uncorrectable bus errors from propagating as system-wide shutdowns while preserving the redundancy benefits of teamed NICs.
Solution Approach 2:
The patent converts the harmful effect of uncorrectable bus errors into a beneficial recovery opportunity by identifying isolated NIC failures and using the teamed NIC configuration to maintain system operation. What was previously a system-crippling error becomes a manageable event that triggers graceful degradation rather than shutdown.
3Measurement precision
If uncorrectable errors are treated as catastrophic, then error detection precision is maintained, but system operation deteriorates due to excessive shutdowns
Solution Approach 1:
The patent applies local quality by differentiating error handling based on the specific characteristics and location of each error. Instead of applying a uniform catastrophic response to all uncorrectable errors, the system analyzes error source identification data to determine whether each error is localized to a specific NIC or affects the system globally, applying appropriate handling quality to each case.
Solution Approach 2:
The patent introduces dynamics into error handling by making the response adaptive rather than static. The system dynamically adjusts its reaction to uncorrectable errors based on real-time analysis of error characteristics, teaming configuration status, and isolation determination, transforming rigid error handling into a flexible, context-aware process.
Data Source
AI summary
A method for recovery from uncorrectable errors in an information handling system including an operating system (OS) and one or more network interface cards (NICs) is provided. The method may include detecting an uncorrectable error; determining whether the uncorrectable error is isolated to a particular NIC; determining whether the particular NIC is teamed with one or more other NICs; and notifying the OS of a successful recovery from the uncorrectable error if it is determined that (a) the uncorrectable error is isolated to a particular NIC, and (b) the particular NIC is teamed with one or more other NICs.