SSD Multi-Streaming Mechanism for Journal Data Fragmentation
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Solution Overview
Problem
The use of double-write approaches in SSDs leads to internal fragmentation of flash memory, causing performance degradation and a shorter SSD lifetime due to inefficient garbage collection in storage systems that employ journaling.
Innovation Solution
Implementing a multi-streaming approach where journal writes and data writes are directed to different streams or blocks within the SSD, avoiding intermingling and thus minimizing fragmentation by allowing for independent garbage collection processes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If double-write approach is used in SSDs, then data durability and performance are improved, but flash memory internal fragmentation increases
Solution Approach 1:
The patent divides the SSD storage space into separate streams: a journal stream for storing journal entries and a data stream for storing actual data. This segmentation prevents intermingling of journal and data writes, allowing independent garbage collection for each stream and eliminating the fragmentation problem caused by double-write operations.
Solution Approach 2:
The patent extracts the journal writing function from the data writing function by creating a dedicated journal stream. This separation allows the journal to be written independently without affecting data write operations, and enables garbage collection to operate efficiently on each stream separately, preventing fragmentation.
2Reliability
If double-write approach is used in SSDs, then data durability is ensured, but garbage collection efficiency deteriorates
Solution Approach 1:
By segmenting storage into separate journal and data streams, the patent enables independent garbage collection operations for each stream. This segmentation prevents the garbage collection process from having to manage mixed journal and data blocks, significantly improving garbage collection efficiency while maintaining data durability through the journaling mechanism.
Solution Approach 2:
The patent introduces separate stream identifiers as intermediaries to manage the relationship between journal writes and data writes. These stream identifiers act as mediators that organize the double-write process and enable efficient garbage collection by clearly delineating which blocks contain journal entries and which contain data, eliminating the need for complex garbage collection management.
3Productivity
If double-write approach is used in SSDs, then storage system performance is improved, but read/write latency increases
Solution Approach 1:
The patent segments the write operations into separate journal stream and data stream paths. This segmentation allows parallel processing of journal writes and data writes without interference, reducing the time penalty associated with double-write operations. The separate streams enable optimized garbage collection that minimizes impact on read/write latency while maintaining high storage system performance.
Data Source
AI summary
A system and method for using multi-streaming with journal information (305) and data (325) is disclosed, when using an application (125) and/or a data storage system (120) that performs double-writes. A journal write request (310) can be sent with the journal information (305) specifying that the journal information (305) should be written to one stream (315). The data write request (320) can be sent with the data (325) specifying that the data (325) should be written to another stream (330). A controller (135) on the storage device (130) can then write the journal information (305) to a block (405, 410) associated with the first stream (315) and the data (325) to a block (415, 420) associated with the second stream (330).