Storage Controller Zone Information Recovery After Power Loss
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Solution Overview
Problem
Existing storage devices face issues with inconsistent zone information between a host and the storage device due to sudden power-offs, leading to unreliable read and write operations.
Innovation Solution
A storage device with a controller that updates zone information for a target zone during recovery from a sudden power-off, transmits an exception event alert message to the host, receives a command, and responds with the updated zone information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the storage device does not update zone information after sudden power-off, then the device complexity is reduced, but the reliability of zone information consistency between host and storage device deteriorates
Solution Approach 1:
The storage device performs preliminary actions by updating zone information during the recovery operation after sudden power-off. The controller identifies the state of each zone (open, closed, or full) and proactively updates the zone information before the host can detect inconsistencies, ensuring data integrity without requiring complex post-failure diagnostics
Solution Approach 2:
The controller implements feedback by transmitting an exception event alert message to the host when zone information is updated during recovery. This feedback mechanism notifies the host of the inconsistency resolution, allowing the host to synchronize its zone information with the storage device, thereby maintaining consistency without increasing device complexity
2Reliability
If the storage device updates zone information during recovery operation, then the reliability of read and write operations is improved, but the loss of time during recovery increases
Solution Approach 1:
The recovery operation is segmented into distinct phases: identifying zone states, updating zone information in the memory device, transmitting exception alert messages, and handling host commands. This segmentation allows the controller to process each zone independently and efficiently, reducing overall recovery time while ensuring reliable read and write operations through systematic zone-by-zone verification
Solution Approach 2:
The controller rushes through the recovery process by immediately updating zone information upon detecting sudden power-off conditions, rather than waiting for normal shutdown procedures. The exception event alert message is transmitted promptly to notify the host, allowing the system to quickly resume normal operations with reliable read and write capabilities restored
3Reliability
If the storage device transmits exception event alert message immediately after updating zone information, then the reliability of information synchronization is improved, but the productivity of the storage device deteriorates
Solution Approach 1:
The storage device employs periodic action by transmitting the exception event alert message at specific intervals during the recovery operation - specifically after zone information is updated but before normal command processing resumes. This periodic notification ensures reliable information synchronization between host and storage device while minimizing disruption to overall productivity, as the alert transmission is a brief, scheduled event rather than a continuous interruption
Data Source
AI summary
A storage device may update, when executing a recovery operation for a sudden power-off, zone information for a target zone among a plurality of zones, and may transmit, after updating the zone information, an exception event alert message to a host. Further, the storage device may receive, after transmitting the exception event alert message, a command from the host, and may transmit updated zone information to the host as a response to the command.