Storage Capacity Recovery Control for SSD Performance
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Solid-state storage devices face issues with storage capacity recovery, leading to inconsistent performance and premature failure due to uneven data distribution and slow erase operations, which affect the usability and lifespan of the devices.
Innovation Solution
A method and system for managing storage capacity recovery by determining a write bandwidth and target capacity reclaim rate, adjusting reclaim rates based on usage, and using feedback control to optimize storage operations, including a monitor module, target module, reclaim rate module, and capacity panic module to dynamically manage storage capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If storage capacity recovery is performed in on/off step-function cycles, then storage capacity is recovered, but foreground I/O performance becomes unpredictable and inconsistent
Solution Approach 1:
The patent implements periodic capacity recovery operations that run continuously at controlled intervals rather than in on/off cycles. The system periodically evaluates storage capacity metrics and initiates recovery operations when thresholds are met, creating a smooth, predictable periodic pattern that avoids sudden performance disruptions while maintaining consistent I/O performance.
Solution Approach 2:
The system dynamically adjusts the capacity recovery rate based on real-time monitoring of foreground I/O workload and storage metrics. When I/O demand is high, recovery operations are throttled or paused; when demand is low, recovery proceeds at optimal rates. This dynamic adaptation ensures consistent performance while recovering capacity efficiently.
2Quantity of substance
If capacity recovery runs until a certain amount of free space is recovered, then storage capacity is maximized, but foreground I/O latency increases and performance suffers
Solution Approach 1:
The system continuously monitors foreground I/O latency, throughput, and capacity recovery progress, using this feedback to dynamically adjust recovery rates. When latency thresholds are exceeded or performance degradation is detected, the system automatically reduces or pauses recovery operations. This closed-loop feedback control ensures capacity recovery proceeds without compromising I/O performance.
Solution Approach 2:
The capacity recovery rate is dynamically adjusted based on real-time system conditions rather than running at a fixed maximum rate. The system adapts recovery intensity to match available I/O capacity, ensuring that recovery operations never consume more resources than the system can spare without impacting user workloads.
3Ease of operation
If solid-state storage is treated as traditional random access device, then data writing is simplified, but data distribution becomes uneven leading to premature failure
Solution Approach 1:
The system performs preliminary wear-leveling actions by proactively migrating data from heavily used storage cells to less used cells before failure occurs. Capacity recovery operations identify and relocate data from cells approaching their write endurance limits, distributing wear more evenly across the storage medium and extending device lifespan while maintaining simple write operations.
Data Source
AI summary
An apparatus, system, and method are disclosed for managing storage capacity recovery. A monitor module determines a workload write bandwidth for a sequential log-based data storage device. The workload write bandwidth includes a rate at which workload write operations generate reclaimable storage capacity on the data storage device. A target module determines a target reclamation write bandwidth for the data storage device. A capacity reclaim rate is associated with the target reclamation write bandwidth. The capacity reclaim rate satisfies the workload write bandwidth for the data storage device. A reclaim rate module determines a prospective reclamation write bandwidth for the data storage device, based on the workload write bandwidth, to correspond to the capacity reclaim rate associated with the target reclamation write bandwidth.