Memory Buffer Data Recovery via Barrier Command Index Tracking
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Solution Overview
Problem
Memory systems face challenges in data recovery after a data loss event, particularly when using multiple buffers, as existing techniques are insufficient to confirm that all data associated with a prior barrier command has been written, leading to inefficient recovery processes.
Innovation Solution
Implementing a technique that keeps track of barrier commands and the last barrier command for which all associated data has been written, allowing for comparison during recovery operations to determine if a complete set of data has been written, and discarding data if it was not fully written.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If multiple buffers are used for data storage, then data storage capacity and flexibility are improved, but data recovery correctness deteriorates because existing techniques cannot confirm that all data associated with a prior barrier command has been written
Solution Approach 1:
The patent applies preliminary action by maintaining a record of the last barrier command index before a data loss event occurs. This pre-established record allows the system to quickly determine during recovery whether data was fully written by comparing the current barrier command index against the recorded last complete barrier command index, eliminating the need for complex post-event verification of multiple buffers.
Solution Approach 2:
The patent introduces an intermediary mechanism in the form of a barrier command index tracker that mediates between multiple buffers and the recovery process. This tracker serves as an intermediary record that simplifies the recovery verification process by providing a single reference point (the last complete barrier command index) against which all buffer data can be validated.
2Reliability
If synchronization caching or forced writing operations are used to ensure data completeness, then data recovery correctness is improved, but system performance and efficiency deteriorate
Solution Approach 1:
The patent applies self-service by enabling the recovery process to autonomously determine data completeness through index comparison without requiring external synchronization caching or forced writing operations. The system serves itself by using the pre-maintained barrier command index record to automatically verify whether data was fully written, eliminating the need for performance-degrading intervention operations.
3Reliability
If complex verification processes are used to confirm data completeness during recovery, then data recovery correctness is improved, but recovery time and computational resources increase
Solution Approach 1:
The patent extracts the essential verification information (barrier command completion status) into a separate, easily comparable form (the last complete barrier command index record). This extraction allows the recovery process to quickly determine data completeness through a simple index comparison rather than performing complex verification processes across multiple buffers, significantly reducing recovery time while maintaining correctness.
Data Source
AI summary
Methods, systems, and devices for memory operations are described. Data for a set of commands associated with a barrier command may be written to a buffer. Based on a portion of the data to be flushed from the buffer, a determination may be made as to whether to update an indication of a last barrier command for which all of the associated data has been written to a memory device. Based on whether the indication of the last barrier command is updated, a flushing operation may be performed that transfers the portion of the data from the buffer to a memory device. During a recovery operation, the portion of the data stored in the memory device may be validated based on determining that the barrier command is associated with the portion of the data and on updating the indication of the last barrier command to indicate the barrier command.