Interleaved DIMM Namespace-Based Error Repair
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Solution Overview
Problem
Existing information handling systems face challenges in predictive failure handling of interleaved dual in-line memory modules (DIMMs), particularly in detecting and addressing errors that exceed error correcting code (ECC) thresholds, which can lead to data unavailability and system instability.
Innovation Solution
Implementing a custom DIMM-level namespace-based threshold system that partitions DIMMs into logical partitions, uses namespace labels to identify error locations, and performs repair mechanisms such as data remapping or redundancy to maintain system integrity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If interleaved dual in-line memory modules (DIMMs) are used to increase memory capacity and performance, then productivity is improved, but reliability deteriorates due to increased difficulty in detecting and addressing errors that exceed ECC thresholds
Solution Approach 1:
The patent segments the memory system by introducing namespace labels that partition memory addresses into distinct logical regions. Each namespace label identifies a specific DIMM or portion thereof, enabling granular error tracking and isolation. This segmentation allows the system to monitor error rates per namespace independently, improving reliability without sacrificing the overall memory capacity and performance gains from interleaved DIMMs.
Solution Approach 2:
The patent introduces namespace labels as an intermediary mechanism between the physical memory hardware and the error detection system. These labels act as mediators that map physical memory locations to logical partitions, enabling the error detection logic to identify which specific DIMM or memory region generated an error. This intermediary layer resolves the reliability issue by providing clear error attribution without changing the underlying interleaved memory architecture.
2Reliability
If error correcting code (ECC) thresholds are used to detect DIMM errors, then reliability is improved, but loss of information occurs when errors exceed the threshold leading to data unavailability
Solution Approach 1:
The patent extracts the namespace identification information from the error detection process and separates it from the ECC correction mechanism. When an error exceeds the ECC threshold, the namespace label already associated with the affected memory address enables the system to identify and isolate the problematic data region. This extraction allows the system to handle uncorrectable errors more gracefully by preventing widespread data unavailability through targeted isolation rather than blanket failure.
Solution Approach 2:
The patent implements preliminary action by pre-associating namespace labels with memory addresses before errors occur. This preliminary tagging enables the system to quickly identify affected data regions when errors exceed ECC thresholds, allowing for rapid isolation and protection of unaffected data. The pre-established namespace mapping prevents information loss by enabling selective handling of only the affected namespace rather than making entire memory regions unavailable.
3Reliability
If custom DIMM-level namespace-based threshold system is implemented to identify error locations, then reliability is improved, but device complexity increases due to additional partitioning and namespace management
Solution Approach 1:
The patent merges the namespace management functionality with the existing memory control logic. Rather than implementing a separate complex partitioning system, the namespace labels are integrated into the existing memory address translation and error handling pathways. This merging approach enables reliable error location identification while minimizing additional complexity by reusing existing control structures and data paths.
Solution Approach 2:
The patent implements universality by designing the namespace label system to serve multiple functions simultaneously: it provides error location identification, enables logical memory partitioning, and supports future scalability for different memory configurations. This multi-functional design reduces overall device complexity by consolidating what could be separate systems into a single unified namespace management mechanism that handles multiple tasks.
Data Source
AI summary
An information handling system includes interleaved dual in-line memory modules (DIMMs) that are partitioned into logical partitions, wherein each logical partition is associated with a namespace. A DIMM controller sets a custom DIMM-level namespace-based threshold to detect a DIMM error and to identify one of the logical partitions of the DIMM error using the namespace associated with the logical partition. The detected DIMM error is repaired if it exceeds an error correcting code (ECC) threshold.