RAID Control Device Physical Storage Area Assignment
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Solution Overview
Problem
In RAID devices, the high failure rate of near-line HDDs on the outer periphery leads to increased recovery time and data loss due to multiple failures, as existing technologies do not effectively manage physical storage area usage across different disk locations.
Innovation Solution
A control device that assigns different physical storage area start locations to each HDD within a RAID group, using a processor to distribute access and manage logical volumes across the HDDs, thereby reducing the likelihood of simultaneous failures by averaging the use of outer, center, and inner periphery areas.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If the outer periphery of the disk is used for storage, then the reading/writing speed and performance are improved, but the failure rate increases
Solution Approach 1:
The patent applies local quality by assigning different start locations to different HDDs based on their physical characteristics. Specifically, HDDs with higher failure rates (typically outer periphery) have their start locations shifted to areas with lower failure rates, while maintaining optimal performance characteristics. This creates non-uniform quality distribution across different storage devices in the RAID group.
Solution Approach 2:
The patent changes the parameter of start location assignment dynamically based on failure rate characteristics. The control device calculates failure rates for different physical locations and adjusts the start location parameter accordingly, rather than using a fixed assignment scheme. This allows the system to adapt to the specific reliability characteristics of each HDD.
2Productivity
If the outer periphery is prioritized for storage assignment, then performance is improved, but the occurrence probability of multiple simultaneous failures increases
Solution Approach 1:
The patent applies local quality by assigning different start locations to different HDDs based on their physical characteristics. Specifically, HDDs with higher failure rates (typically outer periphery) have their start locations shifted to areas with lower failure rates, while maintaining optimal performance characteristics. This creates non-uniform quality distribution across different storage devices in the RAID group.
Solution Approach 2:
The patent changes the parameter of start location assignment dynamically based on failure rate characteristics. The control device calculates failure rates for different physical locations and adjusts the start location parameter accordingly, rather than using a fixed assignment scheme. This allows the system to adapt to the specific reliability characteristics of each HDD.
3Device complexity
If conventional uniform start location assignment is used, then device complexity is reduced, but reliability decreases due to concentrated failures
Solution Approach 1:
The patent changes the parameter of start location assignment dynamically based on failure rate characteristics. The control device calculates failure rates for different physical locations and adjusts the start location parameter accordingly, rather than using a fixed assignment scheme. This allows the system to adapt to the specific reliability characteristics of each HDD.
Solution Approach 2:
The system performs self-service by automatically calculating failure rates and determining optimal start locations without requiring manual intervention. The control device autonomously analyzes the characteristics of each HDD and configures the assignment parameters accordingly, reducing the need for complex manual management while improving reliability.
Data Source
AI summary
A control device controlling a plurality of disk devices to which a physical storage area is assigned in response to a logical storage area accessed from an upper device includes a processor, and the processor assigns an assignment start location of the logical storage area of the plurality disk devices to respectively different physical locations.