Solid State Disk Timestamp Data Management
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Solution Overview
Problem
In solid state storage devices, the existing TRIM methods are inefficient due to tight coupling with normal data streams, increased memory demand, and complexity, as they rely on bitmap storage for TRIM information, which requires frequent updates and caching, degrading performance.
Innovation Solution
A data management method for solid state disks that involves adding timestamps to written data and marked information, allowing for efficient marking of invalid data by comparing timestamps, thereby reducing the need for memory and system complexity, and decoupling TRIM information from normal data streams.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If TRIM information is saved in a way of a bitmap, then the TRIM information can be stored, but more storage space is taken up and the system complexity increases
Solution Approach 1:
The patent extracts the timestamp information from the TRIM marking process and stores it separately in the file system metadata, rather than embedding it within the bitmap structure in the solid state storage device. This separation reduces the complexity of the storage system while maintaining the ability to track and manage invalid data blocks effectively.
Solution Approach 2:
The timestamp mechanism serves multiple functions: it tracks when data was written, determines validity of TRIM operations, and enables efficient garbage collection decisions. By using a universal timestamp field in the file system metadata, the system avoids needing separate complex structures for each function.
2Productivity
If TRIM information is cached in memory to accelerate updating, then the updating speed improves, but the demand for memory increases
Solution Approach 1:
The patent performs TRIM marking operations asynchronously in the background without requiring real-time memory caching. The file system writes data with timestamps, and TRIM operations are processed by comparing timestamps later during garbage collection, eliminating the need for memory caching of TRIM information.
3Measurement precision
If TRIM information is updated in time when file system writes new data, then the accuracy of TRIM information is maintained, but TRIM is tightly coupled with normal data stream and efficiency is reduced
Solution Approach 1:
Instead of continuously updating TRIM information with every data write operation, the patent uses periodic timestamp-based validation during garbage collection cycles. The file system writes data with timestamps, and TRIM accuracy is maintained by comparing these timestamps periodically during garbage collection rather than requiring continuous updates.
Data Source
AI summary
The present invention is applied to the technical field of solid-state storage, and provided are a solid state disk and a data management method and system. The data management method for a solid state disk comprises: saving the written data in a solid state disk after adding a timestamp to written data; receiving a mark command for marking the data to be invalid, marking an address range corresponding to the invalid data, and saving the marked information in the solid state disk after adding a timestamp to the marked information; comparing the timestamp of the marked information with the timestamp of the data in the marked address range after starting the solid state disk; if the timestamp of the data in the marked address range is earlier than the timestamp of the marked information, marking the address range as invalid, otherwise not marking the address range as invalid.