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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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What Are the Differences Between Synchronous Remote Replication and Asynchronous Remote Replication

What Are the Differences Between Synchronous Remote Replication and Asynchronous Remote Replication

Question

What are the differences between synchronous remote replication and asynchronous remote replication?

Answer

Both synchronous remote replication and asynchronous remote replication can be used to back up data remotely, implementing disaster recovery for a storage system. However, synchronous remote replication and asynchronous remote replication are implemented in different modes and applicable to different service scenarios.

  • Implementation mode
    • Synchronous remote replication: When data is being written to the primary LUN, a write request is also sent to the secondary LUN. After both primary LUN and secondary LUN return a write success response, the storage system returns a write success response to the host. This ensures real-time data synchronization between the primary LUN and the secondary LUN.
    • Asynchronous remote replication: When writing data to the primary LUN, the primary site records the changed data. After the primary LUN returns a write success response, the primary site returns a write success response to the host. Then, data synchronization is performed manually or automatically based on user-defined trigger conditions to ensure data consistency between the primary LUN and the secondary LUN.
  • Application scenario
    • Synchronous remote replication requires high bandwidth and low latency. Therefore, synchronous remote replication typically applies to disaster recovery scenarios where the primary device and the secondary device are adjacent to each other, for example, data backup and disaster recovery within the same city.
    • Asynchronous remote replication does not require high bandwidth and low latency. Therefore, asynchronous remote replication applies to disaster recovery scenarios where the primary device and the secondary device are far from each other or network bandwidth is limited.
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Updated: 2019-01-28

Document ID: EDOC1000077758

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