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FusionStorage V100R006C30 Block Storage Service Disaster Recovery Feature Guide 03

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Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document. Note: Even the most advanced machine translation cannot match the quality of professional translators. Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).
Principles of Remote Replication

Principles of Remote Replication

Remote replication periodically synchronizes data between the primary and secondary ends to implement system disaster recovery. This minimizes service performance deterioration caused by remote data transmission delay.

Each remote replication pair consists of a primary volume and a secondary volume. Figure 1-3 shows the principles of remote replication. The blocks in different colors represent the data written at different time points.

Figure 1-3  Principles of remote replication
  1. In normal cases, the primary volume carries data read/write services. Before data synchronization, data on the primary and secondary ends is inconsistent.
  2. After data synchronization is complete, data on the primary and secondary ends is consistent. The following scenarios exist when the primary volume is faulty:

    Enable secondary resource protection before data synchronization. Disable secondary resource protection before a primary/secondary switchover.

    • When the primary volume is faulty and data on the primary and secondary ends is consistent, perform a primary/secondary switchover.
      1. When the primary volume is faulty, data on the primary and secondary ends is consistent.
      2. Disable secondary resource protection. The secondary volume carries data read and write services.
      3. After the primary volume recovers, perform a primary/secondary switchover, enable secondary resource protection, and synchronize data.
    • When the primary volume is faulty and data on the primary and secondary ends is inconsistent, perform a primary/secondary switchover.
      1. When the primary volume is faulty, data on the primary and secondary ends is inconsistent.
      2. Disable secondary resource protection. The secondary volume carries data read and write services.
      3. After the primary volume recovers, perform a primary/secondary switchover, enable secondary resource protection, and synchronize data. The system will lose data that has not been synchronized from the primary volume to the secondary volume.
    • After the primary volume is faulty, do not perform a primary/secondary switchover.
      1. After the primary volume is faulty, do not perform a primary/secondary switchover. The secondary volume carries data read and write services.
      2. After the primary volume recovers, the primary volume carries data read and write services, and data on the primary and secondary volumes is inconsistent.
      3. Enable secondary resource protection to synchronize data. The system will lose data written to the secondary volume when the secondary volume carries services.
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Updated: 2019-01-17

Document ID: EDOC1100044928

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