Memory Module Initialization with Power Fail Isolation
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Solution Overview
Problem
In server data centers with multiple dual in-line memory modules (DIMMs), if a voltage regulator fails, it is often impractical to remove the faulty DIMM without affecting operational ones, leading to a need for electrical isolation during initialization to maintain system functionality.
Innovation Solution
Implementing a method to initialize and electrically isolate failed DIMMs with faulty voltage regulators during server initialization, using a memory controller and power management integrated circuit to manage voltage regulators and log errors, allowing operational DIMMs to continue functioning by tri-stating the bus and disabling output signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a failed DIMM with a faulty voltage regulator is removed from the system, then the faulty component is eliminated, but the operational DIMMs on the same motherboard are also affected and cannot function
Solution Approach 1:
The patent segments the power delivery system by providing individual voltage regulators for each DIMM module. This allows the failed voltage regulator on one DIMM to be isolated without affecting the power supply to other DIMM modules, enabling selective removal of only the faulty component while maintaining system operation with remaining memory capacity.
2Productivity
If a failed DIMM is left installed in the system, then memory capacity is maintained, but the faulty voltage regulator can cause cascading failures to other components
Solution Approach 1:
The patent extracts the faulty voltage regulator from the system by enabling individual DIMM removal while maintaining power isolation. The selective power delivery architecture allows the failed DIMM to be physically removed without impacting the operational status of other DIMM modules, preventing cascading failures while preserving maximum memory capacity.
Solution Approach 2:
The patent implements error logging and detection mechanisms that identify failed voltage regulators before they can cause cascading failures. By detecting and logging errors in advance, the system can proactively isolate and remove the faulty DIMM, preventing potential damage to other components while maintaining system stability.
3Device complexity
If all DIMMs share a common voltage regulator, then the power delivery system is simpler, but a single failure affects all memory modules
Solution Approach 1:
The patent divides the power delivery system into separate, independent voltage regulator modules, each dedicated to a specific DIMM. This segmentation increases device complexity compared to a shared regulator approach but provides critical reliability benefits by isolating failures to individual DIMM modules, allowing selective removal without affecting other memory modules.
Data Source
AI summary
A method and apparatus to detect, initialize and isolate a non-operating memory module in a system without physically removing the memory module from the system is provided. The memory module includes a power management integrated circuit to provide power to a memory integrated circuit on the memory module. During initialization of the memory module, if an error log stored in a non-volatile memory in the memory module indicates a fatal error condition from a prior power cycle, the memory module is electrically isolated.