How Long Does It Take for Data to Be Replicated to the Remote Storage System After a Pair Synchronization Is Started?

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Note that a remote storage system is not equal to the secondary storage system. Data can only be replicated from the primary storage system to the remote storage system. Therefore, when the local storage system is the primary storage system, data of the local storage system can be replicated to the remote storage system after the replication pair is synchronized. However, when the local storage system is the secondary storage system, data cannot be replicated to the remote storage system after the pair synchronization.

The data replication time is determined by the following factors:
The amount of data to be replicated (initial synchronization)
The amount of data changed after the last synchronization (non-initial synchronization)
Network bandwidth
Performance of storage nodes and disks
Number of storage nodes that participate in remote replication
Workload of concurrent system tasks
Replication transmission rate of a pair

Other related questions:
How long does it take to synchronize the data between the active and standby boards of U1900?
The first data synchronization takes about 10 minutes.

Initial synchronization of OceanStor V3 storage systems
Initial synchronization of remote replication for OceanStor V3 storage systems can be performed online.

5300 V3 remote replication specifications
OceanStor 5300 V3 remote replication specifications are as follows: Maximum number of remote replication pairs (synchronous + asynchronous): 256 Maximum number of secondary LUN in each pair: 1 (synchronous) or 2 (asynchronous) Maximum number of connected remote storage devices: 32 Maximum number of remote replication consistency groups: 64 Maximum number of members in a remote replication consistency group: 64 For detailed specifications, see V3R1 Latest Software Specifications.

What Is the Difference Between Synchronous Remote Replication and Asynchronous Remote Replication
Both synchronous remote replication and asynchronous remote replication can be used in disaster recovery solutions implemented by storage systems to back up data remotely. However, they are implemented in different ways and applicable to different service scenarios. Implementation modes are describes as follows: ? Synchronous remote replication: When a host writes data to the primary LUN, a write request is also sent to the secondary LUN. After both LUNs return a response indicating a successful I/O write, the primary storage system sends the host a response indicating a successful I/O write, implementing real-time data synchronization between the primary LUN and the secondary LUN. ? Asynchronous remote replication: When writing data to the primary LUN, the primary storage system records the changed data. After the primary LUN returns a response indicating a successful write, the primary storage system sends the host a response indicating a successful write. Then, data synchronization is triggered by a user manually or by the system based on user-defined trigger conditions to ensure data consistency between the primary LUN and the secondary LUN. Service scenarios are described as follows: ? Synchronous remote replication requires high bandwidth and low data latency. Therefore, synchronous remote replication is typically used in disaster recovery scenarios where the primary and secondary storage systems are adjacent to each other, such as the intra-city data backup and disaster recovery scenario. ? Asynchronous remote replication is not demanding on bandwidth and data latency. Therefore, asynchronous remote replication is applicable to disaster recovery scenarios where the primary and secondary storage systems are far away from each other or the network bandwidth is limited.

Configuring remote replication for V3 series unified storage systems
See the configuration procedure in Remote Replication Feature Guide for Block, which is available at http://support.huawei.com/enterprise/docinforeader.action?contentId=DOC1000084218&idAbsPath=7919749|7941815|21430818|21462748|21041235.

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