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OceanStor 18500, 18800, and 18800F Storage System V100R001C30 Remote Replication Feature Guide 09

This document describes the remote replication feature, in terms of the implementation principle, application scenario, configuration process, and reference information.
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Data Recovery

Data Recovery

After the primary site of a remote replication session fails, the secondary temporarily takes over services of the primary site. When the primary recovers, services are switched back to the primary site. This section describes how the storage system recovers from a site failure. This section will help you with remote replication configuration, site recovery, and fault analysis in disaster recovery scenarios.

When the primary site recovers from a disaster, it is required to rebuild a remote replication between primary and secondary storage systems. And you can use the data on the secondary site to recover the primary site. Figure 1-5 shows how the storage system recovers data at the primary site after a disaster.
Figure 1-5  Process of recovering data at the primary site after a disaster


In an asynchronous remote replication scenario, the storage system performs data synchronization multiple times until the data difference between the primary and secondary LUN is comparatively small. Then, the storage system stops services and performs the last synchronization. This prevents data loss and minimizes the downtime.

Updated: 2019-01-28

Document ID: EDOC1000077758

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