Storage Bandwidth Allocation Using Dynamic I/O Feedback
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Solution Overview
Problem
Existing storage devices face challenges in balancing bandwidth usage among different applications, leading to insufficient bandwidth for some and wasted bandwidth for others, making it difficult to meet varying application needs effectively.
Innovation Solution
A bandwidth control method and storage device that determine a target bandwidth, calculate bandwidth differences, and adjust allocation bandwidth accordingly to match application needs, using a processor to manage bandwidth distribution across zones in ZNS SSDs.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If a fixed bandwidth is allocated to applications using a storage device, then the bandwidth allocation is simple and stable, but some applications may have insufficient bandwidth while others waste bandwidth, making it difficult to balance bandwidth usage
Solution Approach 1:
The patent implements dynamic bandwidth allocation by continuously monitoring application I/O operations and adjusting bandwidth allocation in real-time based on actual usage patterns. The system transitions from static fixed bandwidth to dynamic adaptive bandwidth, allowing the storage device to respond to changing application needs and optimize overall bandwidth utilization.
Solution Approach 2:
The system employs feedback mechanisms by monitoring I/O operation metrics such as IOPS and bandwidth consumption, then using this feedback to adjust bandwidth allocation for different applications. The controller continuously evaluates actual usage and modifies allocation accordingly, creating a closed-loop control system that optimizes bandwidth distribution.
2Speed
If bandwidth is increased for applications with higher workloads, then their performance improves, but applications with lighter workloads will have excessive bandwidth allocation
Solution Approach 1:
The patent applies local quality by allocating different bandwidth levels to different applications based on their specific needs. Instead of uniform bandwidth distribution, the system tailors bandwidth allocation to each application's workload characteristics, ensuring that high-performance applications receive adequate bandwidth while low-utilization applications receive only what they need, minimizing waste.
Solution Approach 2:
The system dynamically changes bandwidth allocation parameters based on monitored I/O performance metrics. By adjusting allocation parameters in response to actual usage patterns, the system optimizes the balance between providing sufficient bandwidth for performance-critical applications and reducing waste for applications with lower requirements.
3Measurement precision
If average bandwidth of multiple past time periods is calculated as usage bandwidth, then the impact of burst I/O traffic on real bandwidth is reduced, but the calculation complexity increases
Solution Approach 1:
The system performs preliminary actions by collecting and storing I/O operation data over multiple time periods before calculating usage bandwidth. This proactive data collection approach allows the system to smooth out burst traffic effects and establish more accurate baseline bandwidth measurements, which are then used for allocation decisions.
Solution Approach 2:
The patent maintains continuous monitoring and calculation of usage bandwidth across multiple time periods, ensuring that bandwidth allocation is based on sustained performance patterns rather than transient bursts. This continuous measurement approach provides more reliable data for optimization while managing computational complexity through efficient averaging algorithms.
Data Source
AI summary
A bandwidth control method and a storage device are provided. The bandwidth control method may include: determining a target bandwidth expected when an application uses a storage device; calculating a bandwidth difference between the target bandwidth and an allocation bandwidth allocated to the application by the storage device; and adjusting the allocation bandwidth to the target bandwidth based on the bandwidth difference.