NVMe SSD I/O Path Recovery via Timer-Based Circuit Reset
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Solution Overview
Problem
Conventional approaches for recovering a hardware-based I/O path in multi-function NVMe SSDs require user intervention and disrupt ongoing I/O transactions, leading to inefficiencies and data integrity issues during failure recovery.
Innovation Solution
Implementing multiple timers to suspend I/O paths and reset frontend and backend circuitry, ensuring pending commands are completed and data integrity is maintained without user intervention, allowing seamless recovery of the hardware-based I/O path.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional recovery approaches are used, then hardware I/O path failures can be recovered, but user intervention is required and ongoing I/O transactions are disrupted
Solution Approach 1:
The system implements automatic recovery mechanisms where the NVMe controller autonomously detects I/O path failures, suspends affected I/O paths, resets frontend and backend circuitry, and resumes transactions without requiring user intervention. The controller manages the entire recovery process including timer-based coordination and selective resetting of circuit components.
2Reliability
If conventional recovery approaches are used, then hardware I/O path failures can be recovered, but ongoing I/O transactions are disrupted leading to inefficiencies
Solution Approach 1:
The system segments the I/O paths and circuitry into frontend and backend portions, allowing selective suspension and resetting of only the affected segments while keeping other I/O paths operational. This granular approach minimizes disruption to ongoing transactions and maintains productivity during recovery operations.
Solution Approach 2:
The system initiates timer-based mechanisms that suspend I/O paths proactively before failures propagate, and coordinates resets of frontend/backend circuitry in advance of potential data integrity issues. This preliminary action prevents cascading failures and maintains overall system productivity.
3Reliability
If multiple timers are implemented for seamless recovery, then user intervention is eliminated and data integrity is maintained, but device complexity increases
Solution Approach 1:
The NVMe controller integrates multiple timer functions within a single control unit, allowing one component to perform multiple timing-related tasks for coordinating I/O path suspension, circuitry resetting, and transaction resumption. This multi-functional approach manages complexity by consolidating timer operations rather than implementing separate mechanisms.
4Reliability
If I/O paths are suspended and circuitry is reset, then data integrity is maintained during recovery, but transaction fulfillment is temporarily halted
Solution Approach 1:
The system dynamically adjusts the suspension and resetting operations based on real-time detection of failure conditions. I/O paths are suspended only when failures are detected, and circuitry resetting is timed to minimize interruption duration. After recovery, transactions are resumed dynamically without fixed delays, optimizing the balance between data integrity and transaction continuity.
Data Source
AI summary
A method includes receiving signaling indicative of performance of a reset operation involving a first physical function associated with a controller of a memory device and initiating a first timer that corresponds to an amount of time available for the first physical function associated with the controller of the memory device to complete execution of pending commands. The method further includes initiating a second timer that corresponds to an amount of time available for a second physical function associated with the controller of the memory device to complete execution of pending commands and initiating a third timer that corresponds to an amount of time available for the second physical function associated with the controller of the memory device to join a recovery operation that is instigated as a result of performance of the reset operation.