Storage Cache Layer Selection Using Dynamic Cache Attributes
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Solution Overview
Problem
Existing data storage devices inefficiently utilize caches based solely on cache size or speed, leading to suboptimal performance without considering host behavior and command-specific factors.
Innovation Solution
The solution involves defining cache layer priorities dynamically based on attributes such as cache release time, arrival time, release rate, arbitration policy, and eviction ratio, allowing for command-specific cache selection and exposure of these attributes to the host.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If cache selection is based solely on cache size or speed, then the system is simple to operate, but cache performance is suboptimal
Solution Approach 1:
The patent implements dynamic cache layer priority definition where cache priorities are not fixed but change based on command attributes. The system dynamically adjusts which cache layer is used for reading or writing based on real-time command characteristics, allowing optimal cache performance while maintaining operational simplicity through automated decision-making.
Solution Approach 2:
The patent changes the parameters used for cache selection from static attributes (size, speed) to dynamic attributes including command size, command type, and timing parameters. This parameter transformation enables the system to adapt cache selection to specific command requirements, improving performance without complicating user interaction.
2Productivity
If dynamic cache layer priority is defined based on multiple attributes, then cache performance is optimized, but device complexity increases
Solution Approach 1:
The system performs self-service by automatically determining optimal cache layers based on command attributes without requiring external intervention. The controller internally evaluates command characteristics and selects appropriate cache layers autonomously, managing the complexity internally while presenting a simple interface to the host.
Solution Approach 2:
The patent incorporates feedback mechanisms where the system monitors command execution and adjusts cache layer priorities accordingly. By learning from command patterns and execution results, the system refines its cache selection strategy, optimizing performance while containing complexity through adaptive control.
3Adaptability or versatility
If cache attributes are exposed to the host, then adaptability improves, but measurement and detection difficulty increases
Solution Approach 1:
The patent creates simplified representations or copies of complex cache attributes that can be easily communicated to the host. Instead of exposing raw complex cache state information, the system provides summarized or transformed attribute data that maintains adaptability while reducing measurement and detection complexity for the host.
Data Source
AI summary
A data storage device and method are disclosed for defining caching layers based on cache attributes. In one embodiment, a data storage device is provided comprising a non-volatile memory, a plurality of caches, and one or more processors. The one or more processors, individually or in combination, are configured to: receive a command from a host to read data from the non-volatile memory; select a cache from the plurality of caches based on at least one cache attribute other than speed; read the data from the non-volatile memory; and store the data in the selected cache. Other embodiments are provided.