Solid State Drive Remove-on-Delete Command for Invalid Data Management
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Solution Overview
Problem
Solid state drives (SSDs) face performance degradation and reliability issues due to unnecessary operations on invalid data, as they lack the ability to differentiate between valid and invalid data, leading to inefficient write merge and wear leveling operations.
Innovation Solution
Implementing an interface to communicate invalid data information and a 'remove-on-delete' command that allows the SSD to mark deleted data as invalid, thereby avoiding unnecessary operations on such data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If SSD performs write merge operations on all data blocks, then data integrity is maintained, but performance deteriorates due to unnecessary operations on invalid data
Solution Approach 1:
The system performs preliminary marking of data blocks as invalid when delete commands are received, before actual write operations occur. This advance identification allows the SSD to recognize and skip invalid blocks during subsequent write merge operations, eliminating unnecessary processing while maintaining data integrity for valid blocks.
Solution Approach 2:
The patent introduces an intermediary invalid data marker (such as a garbage collection indicator or valid bit) that mediates between the file system's delete commands and the SSD's write operations. This intermediary mechanism allows the SSD to differentiate between valid and invalid data without requiring complex analysis during write operations.
2Reliability
If SSD performs wear leveling operations on all blocks, then data reliability is improved, but device lifespan deteriorates due to unnecessary writes on invalid data
Solution Approach 1:
The system marks data blocks as invalid in advance through the remove-on-delete command, enabling the wear leveling algorithm to identify and exclude these blocks from relocation operations. This preliminary identification prevents unnecessary write cycles on invalid data, extending memory cell lifespan while maintaining reliability for valid data through selective wear leveling.
3Reliability
If SSD performs operations on all data blocks, then data completeness is maintained, but energy consumption increases due to unnecessary operations on invalid data
Solution Approach 1:
The patent extracts or removes invalid data blocks from the set of blocks subject to normal SSD operations through the remove-on-delete command. By separating invalid blocks from valid blocks, the system eliminates energy-consuming operations on invalid data while maintaining all necessary operations on valid data, thus reducing overall energy consumption without compromising data completeness.
Data Source
AI summary
Technologies for identifying data stored on a solid state drive (“SSD”) device that correspond to data associated with a delete event, and marking the deleted data stored on the SSD as invalid such that the SSD can avoid unnecessary operations on the invalid data. Included are interfaces operable to communicate invalid data information and providing a remove-on-delete command that provides invalid data information sufficient to identify the SSD data to be marked as invalid.