Compressed Data Stream Placement for Lower SSD Write Amplification
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Solution Overview
Problem
The inefficiencies in storing compressed data on Solid State Drives (SSDs) due to varying compression ratios and increased write amplification, leading to inefficient space usage and higher complexity in Flash Translation Layer (FTL) design.
Innovation Solution
Assigning stream IDs to compressed data based on compression characteristics such as compression ratio, speed, and algorithms, allowing for efficient data mapping and placement, reducing write amplification by grouping similarly compressed data together.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If data is compressed for storage on SSD, then storage capacity is increased, but write amplification factor increases and space usage becomes inefficient
Solution Approach 1:
The patent segments compressed data into different streams based on compression characteristics (compression ratio, compression speed, decompression speed). Each stream is assigned a unique stream ID, allowing the SSD to organize and manage compressed data in separate groups. This segmentation prevents write amplification by ensuring that data with similar compression properties are stored together, avoiding the need to rewrite entire blocks when only small portions need updating.
Solution Approach 2:
The patent applies local quality by assigning different stream IDs to different portions of compressed data based on their specific compression characteristics. Instead of treating all compressed data uniformly, the system identifies and separates data with varying compression ratios and speeds, storing each category in dedicated streams. This localized differentiation optimizes space usage and reduces write amplification for each specific data type.
2Productivity
If compressed data is stored in block-based storage, then storage efficiency improves, but space utilization becomes inefficient due to unfilled blocks
Solution Approach 1:
The patent merges multiple compressed data segments with similar compression characteristics into the same stream and block. By grouping data with matching stream IDs, the system fills blocks more efficiently, reducing wasted space. The merging process combines data from different sources that share compression properties, maximizing block utilization while maintaining the benefits of compression.
Solution Approach 2:
The patent changes the organizational parameter from simple block-based storage to stream-based organization within blocks. By introducing stream IDs as an additional organizational dimension, the system can track and manage space usage more precisely, allocating blocks to streams based on their compression characteristics and filling patterns, thereby improving overall space utilization.
3Quantity of substance
If multiple compressed data sections are stored in a single block, then storage density increases, but Flash Translation Layer complexity increases
Solution Approach 1:
The patent introduces stream ID as an intermediary layer between the physical block storage and the logical data management. This stream ID acts as a mediator that simplifies FTL operations by providing a clear mapping mechanism: each stream ID corresponds to specific compression characteristics, making it easier to track, manage, and retrieve data without increasing FTL complexity. The stream ID system serves as an intermediate organization layer that handles the complexity of managing multiple compressed data sections.
Data Source
AI summary
A storage device is disclosed. The storage device may include storage for data. A host interface logic may receive a dataset and a logical address from a host. A stream assignment logic may assign a stream identifier (ID) to a compressed dataset based on a compression characteristic of the compressed dataset. The stream ID may be one of at least two stream IDs; the compressed dataset may be determined based on the dataset. A logical-to-physical translation layer may map the logical address to a physical address in the storage. A controller may store the compressed dataset at the physical address using the stream ID.