Storage Device Access Credit Allocation for Disk Performance
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Solution Overview
Problem
Traditional storage systems allocate identical access credits to disks of varying performance types, leading to resource wastage and suboptimal response times, as read and write requests share credits without consideration for disk performance degradation.
Innovation Solution
A method to dynamically allocate access credits based on disk type, I/O request type, and performance, separating read and write credits to optimize resource utilization and adapt to performance changes, ensuring efficient I/O operations across a RAID system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If identical access credits are allocated to all disks, then resource allocation is simple and uniform, but high-performance disks cannot fully utilize their capacity leading to resource wastage
Solution Approach 1:
The patent implements differentiated access credit allocation where each disk receives credits tailored to its specific performance characteristics. High-performance disks receive more credits while lower-performance disks receive fewer credits, ensuring each disk operates at optimal utilization without wasting resources on over-provisioning or under-provisioning.
Solution Approach 2:
The access credit allocation is made dynamic rather than static. The system continuously monitors disk performance metrics and adjusts access credits in real-time based on current disk health, workload conditions, and performance degradation patterns, allowing the allocation to adapt to changing system conditions.
2Loss of time
If read and write requests share the same access credits, then credit management is simplified, but the short response time advantage of read requests cannot be fully utilized
Solution Approach 1:
The patent segments access credits into distinct pools for read operations and write operations. Read requests are served from a dedicated read credit pool while write requests use a separate write credit pool. This segmentation allows read requests to be processed with higher priority and faster response times without being blocked or delayed by write operations.
Solution Approach 2:
The system applies different parameters and weighting factors to read and write credits. Read credits are allocated with parameters that favor faster processing and lower latency, while write credits use parameters optimized for data integrity and completion. This parameter differentiation enables the system to exploit the inherently shorter response time of read operations.
3Reliability
If access credits are statically allocated to disks, then allocation is straightforward and stable, but performance degradation due to disk wear cannot be compensated
Solution Approach 1:
The patent implements a feedback mechanism where disk performance metrics are continuously monitored and fed back to the access credit allocation algorithm. When performance degradation is detected (such as increased latency or error rates due to wear), the system automatically adjusts access credits to reduce the load on degraded disks and redistribute capacity to healthier disks, maintaining overall system reliability.
Solution Approach 2:
The system performs self-adjustment of access credits based on monitored performance conditions without requiring external intervention. The credit allocation mechanism automatically detects performance changes and reconfigures itself to optimize for current disk conditions, enabling the storage system to self-heal and adapt to wear and tear over time.
Data Source
AI summary
Techniques manage a storage device. Such techniques involve: in response to receiving an I/O request for a storage device comprising a plurality of disks, determining, from the plurality of disks, at least one disk related to the I/O request; allocating, to each of the at least one disk, at least one access credit for completing the I/O request from total access credits of the disk, wherein the total access credits are associated with at least one of a type of the disk, a type of the I/O request and performance of the disk; and in response to respective access credits being allocated to the at least one disk, performing access requested by the I/O request to each of the at least one disk. Such techniques can effectively improve the overall access performance of the storage device.