Storage Controller Dynamic Rearrangement for SSD Performance
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Solution Overview
Problem
Existing SSD technologies do not effectively optimize write requests from host computers to improve access performance and prolong storage medium life, especially in dynamic environments with multiple applications, as they fail to consider the combination of internal processing such as rearrangement and garbage collection.
Innovation Solution
A storage control apparatus and method that includes a rearrangement starter to begin data rearrangement for fragmented data and a controller to evaluate whether this improves access performance, continuing or canceling the process based on performance gains, ensuring efficient data storage and retrieval.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If data rearrangement processing is performed to reduce fragmentation, then access performance is improved, but write request response time may be delayed
Solution Approach 1:
The patent implements dynamic control of rearrangement processing by monitoring write request queues and dynamically adjusting rearrangement execution based on current system state. The rearrangement controller evaluates whether to continue, cancel, or interrupt rearrangement processing based on real-time conditions, making the system adaptive rather than static.
Solution Approach 2:
The patent employs feedback mechanisms where the rearrangement controller continuously evaluates the state of write requests and access performance, then adjusts rearrangement processing accordingly. This closed-loop control ensures that rearrangement operations are performed only when beneficial, preventing performance degradation.
2Duration of action of stationary object
If data rearrangement is continuously performed to maintain access performance, then storage medium life is extended, but system complexity increases
Solution Approach 1:
The storage control apparatus performs self-evaluation of its own state through the rearrangement controller, which autonomously determines whether rearrangement processing should be executed based on monitored conditions. This self-service mechanism reduces the need for external control complexity while maintaining optimal operation.
Solution Approach 2:
The patent changes operational parameters dynamically by adjusting whether rearrangement processing is active based on evaluated conditions. Instead of maintaining constant complex control, the system varies its operational state (performing or not performing rearrangement) based on real-time parameter evaluation.
3Loss of time
If rearrangement processing is interrupted to handle write requests, then response time is improved, but access performance degradation occurs
Solution Approach 1:
The patent applies partial action by performing rearrangement processing only to the extent necessary based on current conditions. Instead of completing full rearrangement operations that may delay write requests, the system performs partial rearrangement or cancels operations when write request priority demands immediate response, achieving sufficient performance improvement without excessive delay.
Data Source
AI summary
This invention improves the access performance of a storage medium and prolongs the life of the storage medium while preventing a situation in which a response to a write request is delayed to cause a write error. A storage control apparatus includes a rearrangement starter that starts data rearrangement processing in which fragmented data, which has been determined that data corresponding to a logical address area in a logical address space used by a host computer to access a storage medium are fragmented and stored in a plurality of physical address areas in a physical address space of the storage medium, is written in a continuous physical address area in the storage medium; and a rearrangement controller that evaluates, when receiving a write request from the host computer during the data rearrangement processing, whether the data rearrangement processing improves access performance to the storage medium, and instructs to continue the data rearrangement processing if the access performance is improved, but cancel or interrupt the data rearrangement processing if the access performance is not improved.