Prefetch Command Optimization in Tiered Storage Systems
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Solution Overview
Problem
Current data storage systems face inefficiencies in processing prefetch commands without compromising read cache management efficiency or requiring larger read cache memories, particularly in handling host-generated prefetch commands that intend to read data in the future.
Innovation Solution
A storage controller system that includes a read cache memory and multiple storage tiers, where prefetch data is stored in the fastest storage tier instead of being discarded, and can migrate data between tiers to optimize read performance, using a read flash cache as a cost-effective alternative to the fastest storage tier when necessary.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If prefetch data is stored in read cache memory, then read performance is improved, but read cache memory is consumed and may need to discard other data
Solution Approach 1:
The patent extends the storage hierarchy by introducing a fastest storage tier above the traditional read cache memory. Prefetch data is stored in this new fastest storage tier dimension, preserving read cache memory for other purposes while maintaining fast access performance through the multi-tiered architecture.
2Speed
If read cache memory size is increased to store more prefetch data, then read performance is improved, but system cost and complexity increase
Solution Approach 1:
The patent segments the storage system into multiple tiers with different characteristics: read cache memory for immediate caching needs and a fastest storage tier for prefetch data. This segmentation allows each component to be optimized independently, avoiding the need to oversize the read cache memory while maintaining performance.
3Productivity
If prefetch data is discarded from read cache memory, then cache management efficiency is improved, but read performance deteriorates when prefetch data is needed
Solution Approach 1:
The patent performs preliminary action by storing prefetch data in the fastest storage tier before it is actually needed. This advance preparation ensures that when the data is required, it can be quickly retrieved without compromising read cache memory, thus maintaining both cache management efficiency and read performance.
4Speed
If the fastest storage tier is used for prefetch data, then read performance is improved, but system cost increases
Solution Approach 1:
The patent applies local quality by using the fastest storage tier specifically for prefetch data while keeping read cache memory available for other high-priority data. This localized application of high-performance storage optimizes overall system performance without requiring the entire system to use expensive fast storage media.
Data Source
AI summary
A system is provided. The system includes a storage controller configured to receive a prefetch command from a host interface. The storage controller includes a read cache memory that stores prefetch data in response to the prefetch command and a plurality of storage tiers coupled to the storage controller and providing the prefetch data. The plurality of storage tiers includes a fastest storage tier that stores the prefetch data if the read cache memory discards the prefetch data after storing the prefetch data.