What is Replication

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A method of copying a master index from one server to one or more "slave" or "child" servers.

Other related questions:
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.

Introduction to storage-based replication and host-based replication of OceanStor ReplicationDirector
To protect the mission-critical data of disaster recovery virtual machines, OceanStor ReplicationDirector provides two disaster recovery modes: 1. Storage-based replication: The remote replication feature of the underlying SAN storage replicates and protects data of disaster recovery virtual machines. Both Synchronous remote replication and asynchronous remote replication are supported. 2. Host-based replication: FusionCompute enables the real-time asynchronous replication feature to replicate and protect disaster recovery virtual machine data. The feature is supported by Hypervisor of virtual storage and FusionStorage.

What Is the Difference Between Backup and Replication?

A backup operation stores data of an EVS disk to the local backup storage.

A replication operation copies backups (generated in backup operations, used to restore EVS disk data), and stores the backup copies to the remote backup storage. When the local backups are corrupted, the remote backup copies can be used instead to restore EVS disk data.


Introduction to the asynchronous remote replication period
The asynchronous remote replication period is manually set during the creation of an asynchronous remote replication task. The period control policies include Manual, Timed wait when synchronization begins, and Timed wait when synchronization ends. For a file system, the period control policy can be set to Specify the time policy in addition to the preceding ones.

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