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HyperReplication Feature Guide for Block

OceanStor V5 Series V500R007

This document is applicable to OceanStor 5110 V5, 5110F V5, 5300 V5, 5300F V5, 5500 V5, 5500F V5, 5600 V5, 5600F V5, 5800 V5, 5800F V5, 6800 V5, 6800F V5, 18500 V5, 18500F V5, 18800 V5, and 18800F V5. It describes the working principle and application scenarios of the HyperReplication feature (for block). Also, it explains how to configure and manage the feature.
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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 for remote data backup and DR. However, the two replication modes work differently and are applicable to different service scenarios.

  • Working principles
    • Synchronous remote replication: When data is being written to the primary LUN, the 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 data is being written 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, the data is manually or automatically synchronized to the secondary LUN based on user-defined trigger conditions to ensure data consistency between the primary LUN and the secondary LUN.
  • Application scenarios
    • Synchronous remote replication requires high bandwidth and low latency. Therefore, synchronous remote replication typically applies to DR scenarios where the primary device and the secondary device are adjacent to each other, for example, data backup and DR in the same city.
    • Asynchronous remote replication does not require high bandwidth and low latency. Therefore, asynchronous remote replication applies to DR scenarios where the primary device and the secondary device are far from each other or network bandwidth is limited.
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Updated: 2019-07-11

Document ID: EDOC1000181492

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