Radiation-Hardened Controller for Non-Radiation-Hardened Storage Drives
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Solution Overview
Problem
Commercial data storage components are not designed to withstand extreme radiation and temperature environments, leading to reliability issues in aerospace and high-radiation applications, and existing radiation-hardened solutions are expensive and lack performance and storage capacity.
Innovation Solution
A radiation-resistant data storage system using non-radiation-hardened drives with a radiation-hardened controller, incorporating error detection and mitigation techniques, selective use of rad-tolerant components, and power management to address radiation-induced events, along with frequent reprogramming of NAND control registers and periodic power cycling to prevent latch-up.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If radiation-hardened storage devices are used, then reliability in high-radiation environments is improved, but cost increases significantly
Solution Approach 1:
The system divides the storage subsystem into two segments: radiation-hardened controllers that manage data integrity and non-radiation-hardened drives that provide storage capacity. This segmentation allows the expensive radiation-hardened components to be used only where critical (the controllers), while the bulk storage components (drives) can be inexpensive commercial off-the-shelf devices.
Solution Approach 2:
The radiation-hardened controller acts as an intermediary between the host system and the non-radiation-hardened drives. It mediates all data operations, implementing error detection, correction, and recovery mechanisms that protect against radiation effects, thereby allowing inexpensive drives to function reliably in high-radiation environments.
2Ease of manufacture
If non-radiation-hardened drives are used, then cost is reduced, but reliability in high-radiation environments deteriorates
Solution Approach 1:
The system uses inexpensive commercial off-the-shelf drives that can be replaced if they fail due to radiation damage. The radiation-hardened controller maintains data integrity by detecting errors and initiating recovery procedures, allowing the system to tolerate drive failures without data loss, effectively treating drives as replaceable components rather than critical failure points.
Solution Approach 2:
The radiation-hardened controller implements preemptive error detection and correction mechanisms that cushion against radiation-induced failures. By continuously monitoring drive health and detecting errors before they cause data loss, the system prevents reliability deterioration despite using non-radiation-hardened drives.
3Reliability
If radiation tolerance is enhanced through error detection and power management, then reliability is improved, but device complexity increases
Solution Approach 1:
The radiation-hardened controller implements self-service mechanisms including automatic error detection, error correction code generation and application, and autonomous power management. The controller monitors its own operation and the drives' operation, detecting latch-up conditions and automatically cycling power to recover from radiation-induced failures without external intervention.
Solution Approach 2:
The system implements feedback loops where the radiation-hardened controller continuously monitors drive operation and data integrity. When errors are detected or latch-up conditions are identified through current monitoring, the controller provides feedback by cycling power or initiating recovery procedures, creating a closed-loop system that maintains reliability despite increased operational complexity.
Data Source
AI summary
A data storage system for use in a high radiation environment has a radiation-hardened storage controller that measures a current draw of a storage drive in a storage array. The storage drive is not radiation-hardened. Based on a characteristic of the current draw, a latch up is detected the storage drive. Based on the detected latch up, power is removed from all or part of the storage drive. After a cooling period has elapsed, the power is reapplied to the storage drive.