Disaster Recovery Data Transmission Mode Switching
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Solution Overview
Problem
The DR system using log synchronous transmission method faces challenges in reducing line costs and maintaining online performance due to high line utilization rates, which can lead to increased remote copy times and potential data loss during disasters, especially when using public lines.
Innovation Solution
The system dynamically switches between synchronous and asynchronous transmission based on response time, ensuring that when the line utilization is high, asynchronous transmission is used to maintain online performance, and when low, synchronous transmission is employed to prevent data loss by monitoring and switching the remote copy method.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If synchronous transmission is used for remote copy, then data loss is prevented, but online processing performance is degraded due to waiting for remote site confirmation
Solution Approach 1:
The patent applies dynamics by making the transmission mode adjustable and switchable between synchronous and asynchronous based on system state. The remote copy system dynamically changes its operation mode: using synchronous transmission when data integrity is prioritized and asynchronous transmission when performance is prioritized, thereby resolving the contradiction between reliability and productivity.
2Productivity
If asynchronous transmission is used for remote copy, then online processing performance is maintained, but data loss may occur during disasters
Solution Approach 1:
The patent applies parameter changes by adjusting the transmission mode parameter (synchronous/asynchronous) based on the response time parameter of the network. When response time exceeds a threshold indicating high line utilization, the system switches to asynchronous mode to maintain performance. This dynamic parameter adjustment resolves the contradiction between productivity and reliability.
3Reliability
If dedicated fiber channel line is used for remote copy, then line quality is ensured, but line cost increases significantly
Solution Approach 1:
The patent applies this principle by replacing the expensive dedicated fiber channel line with a cheaper public network line for the remote copy function. Although the public line has variable quality, the system compensates through intelligent transmission mode selection, thereby reducing line cost while maintaining acceptable performance and reliability.
4Loss of energy
If public line is used for remote copy, then line cost is reduced, but remote copy time increases due to high line utilization rate
Solution Approach 1:
The patent applies dynamics by making the transmission mode switchable based on real-time network conditions. When the public line shows high utilization (indicated by response time threshold), the system dynamically switches to asynchronous mode to reduce remote copy time, thereby compensating for the inherent slowness of public lines and resolving the contradiction between cost and time.
Data Source
AI summary
When a public line is used for a remote copy function of storage in a disaster recovery (DR) system, the online performance is degraded due to the increase and decrease of the line utilization rate. Therefore, it is desired to change the remote copy function depending on the line utilization rate. Also, there is the possibility of data loss if disaster occurs during the copy between storage devices. Therefore, it is desired to perform the processing to detect the data status immediately before the occurrence of the disaster. By switching the synchronous transmission and the asynchronous transmission in accordance with the increase and decrease of the response time of the remote copy function between storage devices, the online performance of the primary site can be maintained without being influenced by the line utilization rate, and the data loss can be detected based on the used remote copy function.