Memory Controller Thermal Shutdown Handling
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Solution Overview
Problem
Flash memory SSDs experience abrupt thermal shutdowns due to high temperatures, leading to data loss and slow recovery as they are unprepared for such shutdowns, necessitating a method to handle ungraceful shutdowns (UGSD) to reduce data loss and facilitate faster recovery.
Innovation Solution
A memory device with temperature detectors and a controller that acquires temperature data, activates thermal throttling, and flushes metadata from volatile memory to non-volatile memory elements when temperatures exceed a threshold, allowing for controlled shutdown and reduced recovery time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If thermal shutdown is performed when temperature exceeds threshold, then protection of NAND flash memories is achieved, but data loss occurs and recovery is slow
Solution Approach 1:
The controller performs preliminary actions by detecting temperature rise and activating thermal throttling before the thermal shutdown threshold is reached. This preliminary intervention prevents the abrupt shutdown by maintaining operation at reduced performance levels, thereby avoiding data loss while still protecting the NAND flash memories from overheating damage.
2Reliability
If thermal shutdown is performed when temperature exceeds threshold, then protection of NAND flash memories is achieved, but recovery time increases
Solution Approach 1:
The controller performs preliminary actions by detecting temperature rise and activating thermal throttling before the thermal shutdown threshold is reached. This preliminary intervention prevents the abrupt shutdown by maintaining operation at reduced performance levels, thereby avoiding the need for lengthy recovery processes and reducing overall recovery time.
Solution Approach 2:
The controller continuously monitors temperature and adjusts operation dynamically through feedback control. When temperature approaches the shutdown threshold, the controller reduces operation intensity, creating a feedback loop that maintains safe operating temperatures without requiring complete shutdown, thus minimizing recovery time while still protecting the NAND flash memories.
3Loss of information
If thermal throttling is activated before thermal shutdown threshold, then data loss is reduced, but operation performance decreases
Solution Approach 1:
The controller applies partial action by activating thermal throttling that reduces but does not eliminate operation performance. Instead of complete shutdown, the controller maintains reduced-level operations that continue to process data at lower throughput, thereby preventing data loss while minimizing the impact on productivity through partial rather than total operational cessation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution effectively reduces data loss and speeds up recovery by proactively managing thermal throttling and metadata flushing, ensuring that metadata is stored in non-volatile memory before a shutdown, enabling quicker system recovery.
Implementation Method 1
one or more temperature detectors configured to measure temperatures of the plurality of NVM elements
Implementation Method 2
activate thermal throttling for the plurality of NVM elements
Data Source
AI summary
A memory device including a controller for handling thermal shutdown of the memory device. The control system acquires temperatures of a plurality of non-volatile memory elements in the memory device from one or more temperature detectors at a first frequency. Upon determining that the temperature of one of the plurality of non-volatile memory elements is above a threshold, the controller activates thermal throttling for the plurality of non-volatile memory elements and flushes metadata from a volatile memory element in the memory device to the plurality of non-volatile memory elements for future recovery of the memory device.