Cache Control Block Track Format Code for Read Write Latency
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Solution Overview
Problem
Current storage systems experience significant latency and context switching costs when processing read/write requests, particularly when data is not in the cache, as they need to retrieve data from storage and reactivate threads, which can lead to failed requests due to time constraints.
Innovation Solution
Incorporating a track format code in the cache control block allows for fast access to track format metadata from a track format table, reducing the need to read metadata from storage, thereby minimizing latency and ensuring timely processing of requests.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of time
If track metadata is read from storage to determine track format, then complete track format information is obtained, but processing latency increases significantly
Solution Approach 1:
The patent extracts only the essential track format code from the complete track metadata and stores it in the cache control block. This extracted code is sufficient to identify the track format without needing to retrieve the full metadata from storage, thereby reducing access latency while maintaining functionality.
Solution Approach 2:
The track format code is pre-computed and stored in the cache control block when data is loaded into the cache. This preliminary action eliminates the need to read and process complete track metadata from storage during subsequent access operations, significantly reducing processing latency.
2Quantity of substance
If complete track metadata is stored in cache control block, then all track format information is available, but cache memory usage increases
Solution Approach 1:
The patent extracts only the essential track format code from the complete track metadata and stores it in the cache control block. This extracted code is sufficient to identify the track format without needing to retrieve the full metadata from storage, thereby reducing access latency while maintaining functionality.
3Speed
If track format code is added to cache control block, then fast access to track format metadata is enabled, but cache control block complexity increases
Solution Approach 1:
The patent creates a simplified copy of the track format information in the form of a format code that can be quickly referenced. This code copy enables fast access to track format metadata without requiring the complex structures of the original metadata, achieving high-speed access while maintaining manageable complexity.
Data Source
AI summary
Provided are a computer program product, system, and method for using a track format code in a cache control block for a track in a cache to process read and write requests to the track in the cache. A track format table associates track format codes with track format metadata. A determination is made as to whether the track format table has track format metadata matching track format metadata of a track staged into the cache. A determination is made as to whether a track format code from the track format table for the track format metadata in the track format table matches the track format metadata of the track staged. A cache control block for the track being added to the cache is generated including the determined track format code when the track format table has the matching track format metadata.