Storage Controller Panic Early Detection for Failure Mitigation
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Solution Overview
Problem
Current data storage devices lack methods for early detection and preparation for panic situations, leading to potential failures and inefficiencies in handling such conditions.
Innovation Solution
Implementing a panic early detection module and control module in data storage devices to detect future panic situations, provide detailed panic data, and offer mitigation options to the host device, including adjusting performance, increasing power, performing evacuation operations, and redirecting commands to another storage device.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If early detection of panic situations is implemented, then reliability is improved, but device complexity increases
Solution Approach 1:
The patent implements early detection of panic situations before they actually occur by monitoring indicators such as power loss detection, I/O errors, and temperature thresholds. This preliminary action allows the system to prepare mitigation strategies in advance, improving reliability by preventing actual panic conditions rather than merely responding to them after occurrence.
Solution Approach 2:
The controller is divided into specialized modules including a panic detection module that monitors specific indicators, a mitigation module that prepares response strategies, and a coordination interface with the host. This segmentation allows each component to focus on specific functions, managing overall device complexity through modular design while achieving comprehensive reliability monitoring.
2Adaptability or versatility
If multiple mitigation options are provided to host device, then adaptability is improved, but ease of operation deteriorates
Solution Approach 1:
The system dynamically presents mitigation options to the host device based on the specific panic condition detected. The mitigation module can offer different strategies such as data evacuation, read-only mode, or device reset depending on the severity and type of panic indicator. This dynamic adaptation allows the system to provide appropriate options for each situation while maintaining ease of operation through automated decision support.
Solution Approach 2:
The system provides feedback to the host device about the detected panic condition and available mitigation options, allowing the host to make informed decisions. The host can select from presented options or allow the controller to automatically implement a default mitigation strategy, balancing adaptability with ease of operation through this feedback loop.
3Productivity
If default mitigation option is performed while waiting for host decision, then productivity is improved, but reliability deteriorates
Solution Approach 1:
The system performs a default mitigation option that is designed to prevent the panic condition from worsening while waiting for host confirmation. For example, if power loss is detected, the default action might be to switch to backup power or enter a protected state that prevents data corruption. This preliminary anti-action maintains productivity by keeping the device operational while protecting reliability through preventive measures.
Solution Approach 2:
The system implements cushioning measures in advance by preparing mitigation strategies and having default actions ready before the panic condition fully develops. This allows the device to maintain operational status and productivity while having protective measures in place that prevent reliability degradation, creating a buffer between the detected issue and actual system failure.
Data Source
AI summary
By detecting panic situations and providing a host device detailed panic data and mitigation options before the panic situation condition occurs, failure of data storage devices may be reduced. Several mitigation options may be presented to the host device upon detection of a future panic situation, such as adjusting read performance; increasing device power; performing evacuation and management operations; and/or redirecting host commands to another data storage device for command completion. When the other data storage device is in the same PCIe tree and reachable, the command may be directed with PRPs/SGLs that point back to the same host device. In some embodiments, the data storage devices may have a submission queue between them. In some embodiments, the data storage device comprises a panic early detection module and a panic control module.