Cached Data Padding with Valid Data to Reduce Write Amplification
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Solution Overview
Problem
Padding cached data with dummy data to meet write granularity in memory devices leads to performance degradation, resource consumption, and increased write amplification, particularly in non-volatile memory systems like NAND devices.
Innovation Solution
Use existing valid data from media management operations, such as garbage collection, to pad cached data instead of dummy data, determining the use of valid data based on valid-to-invalid data ratios and thresholds to minimize write amplification.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If cached data is padded with dummy data to meet write granularity requirements, then write operations can be performed, but write amplification increases and performance degrades
Solution Approach 1:
The patent recovers valid data from victim management units that would otherwise be discarded during media management operations. Instead of treating these units as completely waste, the system extracts and reuses their valid data contents to pad cached data, transforming a waste resource into a useful resource that reduces write amplification.
Solution Approach 2:
The system uses its own internal data resources (valid data within victim management units) to serve the padding requirement, rather than requiring external dummy data generation. This self-service approach eliminates the need for separate dummy data sources and reduces overall system resource consumption.
2Manufacturing precision
If dummy data is used to pad cached data, then write granularity is satisfied, but additional resource consumption occurs
Solution Approach 1:
The patent recovers valid data from victim management units that would otherwise be discarded during media management operations. Instead of treating these units as completely waste, the system extracts and reuses their valid data contents to pad cached data, transforming a waste resource into a useful resource that reduces write amplification.
3Ease of operation
If dummy data padding is performed, then flush commands can execute, but performance degradation occurs
Solution Approach 1:
The system uses its own internal data resources (valid data within victim management units) to serve the padding requirement, rather than requiring external dummy data generation. This self-service approach eliminates the need for separate dummy data sources and reduces overall system resource consumption.
Solution Approach 2:
The patent enables continuous useful action by reusing valid data from victim management units for padding, thereby converting what would be wasted data into a resource that maintains system performance. This approach ensures that data movement serves productive purposes rather than being purely compensatory.
Data Source
AI summary
A victim management unit (MU) for performing a media management operation is identified. The victim MU stores valid data in a first memory device of a plurality of memory devices. A cached data item on a second memory device of the plurality of memory devices is identified. A valid-to-invalid ratio of the victim MU is compared to a threshold value. In view of comparison, it is determined whether to pad the cached data item with at least a subset of the valid data stored at the victim MU or dummy data. Based on the determination, the cached data item padded with one of at least a subset of the valid data stored at the victim MU or the dummy data is written to a target MU.