Storage Device Command Rate Profile Adjustment
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Solution Overview
Problem
Data storage devices face challenges in optimizing host command throughput due to varying operating modes, power consumption, and misalignment between host data blocks and disk block sizes, which affect latency and efficiency.
Innovation Solution
The data storage device adjusts its command rate profile based on operating modes, power settings, and block size misalignment by using a control circuitry to manage command queues, store misaligned data in a write cache, and prioritize background commands to maintain optimal performance and reduce power consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the command rate is increased to improve host command throughput, then productivity improves, but latency increases and power consumption increases
Solution Approach 1:
The patent implements dynamic adjustment of the command rate profile based on detected operating modes. The system transitions between different command rate configurations (e.g., first command rate for benchmark modes, second command rate for normal modes) to optimize performance characteristics. This dynamic adaptation allows the system to achieve high throughput when needed while maintaining lower latency when responsiveness is prioritized.
2Productivity
If the command rate is increased to improve host command throughput, then productivity improves, but power consumption increases
Solution Approach 1:
The system changes operational parameters (command rate profile) based on detected conditions. By switching between different command rate profiles corresponding to different operating modes, the system optimizes the balance between throughput and power consumption. Higher command rates are used only when high performance is required, while lower rates are used during normal operation to conserve energy.
3Productivity
If host data blocks are aligned with disk block sizes to improve efficiency, then productivity improves, but adaptability to different host block sizes deteriorates
Solution Approach 1:
The patent introduces a block alignment layer that acts as an intermediary between the host and the disk. This layer receives host write commands with various block sizes, performs alignment operations with disk block sizes, and manages data buffering. This intermediary mechanism enables efficient disk operations while maintaining compatibility with different host block size requirements.
Solution Approach 2:
The system extracts the block alignment function from the main data path and handles it separately through dedicated alignment logic. By separating the alignment operation from the primary write path, the system can optimize disk block alignment without constraining the host's block size choices, thus maintaining both efficiency and adaptability.
Data Source
AI summary
A data storage device is disclosed comprising a non-volatile memory. A command rate profile is initialized, wherein the command rate profile defines a limit on a number of access commands received from a host as a function of an internal parameter of the data storage device. The command rate profile is adjusted in response to a change in operating mode.