Remote Copy Transfer Control for Storage Processor Load
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Solution Overview
Problem
Existing remote copy techniques that compress data for transfer between storage systems increase processor load, leading to fluctuations and potential deterioration of copy performance, which can fail to maintain a short recovery point objective (RPO).
Innovation Solution
A storage system that selects transfer methods based on processor load information, opting for compression only when loads are below a threshold, and avoiding compression when loads are high to maintain copy performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If compression processing is performed on transfer data, then data transfer efficiency is improved, but processor load increases causing copy performance deterioration
Solution Approach 1:
The patent dynamically selects between compression and non-compression transfer methods based on real-time processor load conditions. The system monitors processor load and adapts the transfer method accordingly, switching from compression when load is low to non-compression when load is high, thereby resolving the contradiction between transfer efficiency and processor load.
Solution Approach 2:
The patent changes the compression parameter (on/off) based on processor load thresholds. When processor load exceeds a predetermined threshold, the system switches from compression processing to non-compression processing, adjusting the parameter to maintain copy performance while still achieving efficient data transfer under varying load conditions.
2Quantity of substance
If compression processing is always performed, then data transfer size is reduced, but copy performance fluctuates failing to maintain short RPO
Solution Approach 1:
The system dynamically adjusts the transfer method based on processor load conditions rather than always using compression. This dynamic adaptation ensures that copy performance remains stable and RPO requirements are met by avoiding compression when processor load would cause performance degradation.
Solution Approach 2:
The patent implements feedback control by monitoring processor load and using this information to determine the appropriate transfer method. The system continuously checks processor load conditions and adjusts the compression setting accordingly, ensuring that copy performance remains within acceptable ranges and RPO objectives are maintained.
Data Source
AI summary
A controller acquires processor load information on the controller and a copy destination storage system, and selects one of a plurality of transfer methods for transferring data to the copy destination storage system based on processor loads. The plurality of transfer methods includes a first transfer method for performing compression processing on transfer data, and a second transfer method for performing no compression processing on the transfer data or performing the compression processing on the transfer data with a processor load lower than that of the first transfer method. The first transfer method is selected under conditions including where each processor and the copy destination storage system is equal to or less than a threshold. The second transfer method is selected under conditions including a condition where at least one of the processor loads of the controller and the copy destination storage system is higher than the threshold.