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FusionStorage V100R006C30 Block Storage Service Disaster Recovery Feature Guide 03

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Creating a Remote Replication Pair

Creating a Remote Replication Pair

Scenarios

A remote replication pair consists of two volumes that form a primary/secondary backup relationship, in which the secondary volume synchronizes data from the primary volume according to the synchronization policy. The primary/secondary relationship within the pair can be switched due to a fault occurred at the primary site or manual intervention.

Perform this operation only for the local FusionStorage Block system.

Prerequisites

  • You have logged in to FusionStorage Block Self-Maintenance Platform.
  • The local and remote devices work normally and correctly communicate with each other.
  • The remote volume has not been mapped to a host.
  • You have obtained the remote volume ID from the volume information list on the remote device.
  • You have created the volumes that are used to create the pair at the local and remote sites. If volumes have not been created, create the volumes first. For details, see Creating a Volume.

Procedure

    1. On FusionStorage Block Self-Maintenance Platform, choose DR Service > dr > DR Cluster, click RepRm Pair Management in the row where the cluster resides.
    2. On the Remote Replication Pair Management page, click Create.
    3. Select a local volume and set the remote volume ID. Click Next.

      NOTE:
      • Ensure that the size of the local volume is consistent with that of the remote volume.
      • If the volumes used to create the remote replication pair are configured with a QoS policy, you are advised to configure the same QoS policy for the local and remote volumes.

    4. Set parameters for the remote replication pair.

      Table 2-21 lists the configuration parameters.

      Table 2-21  Description

      Name

      Description

      Example Value

      Replication Mode

      • Asynchronous: A success response is returned when data writes complete on the local end. The written data will be synchronized to the remote end later to ensure data consistency.Currently, only this mode is supported.
      • Synchronous: A success response is returned only when data writes complete on both the local and remote ends.

      Asynchronous

      Restoration Policy

      A restoration policy determines whether the system automatically synchronizes data after the fault is rectified.
      • Automatic: The system automatically synchronizes data.
      • Manual: Data synchronization must be performed manually.

      Automatic

      Local Resource Type

      LUN

      LUN

      Synchronization Speed

      Data copy rate in KB/s. Value range: [1024,1048576]. System default value: 32768.

      32768

      Initial Synchronization

      Initial synchronization for data at local and remote sites

      • If data at the local and remote sites is inconsistent and needs to be synchronized after creation, set this parameter to ON.
      • If data at the local and remote sites is consistent and does not need to be synchronized after creation, set this parameter to OFF.

      ON

      Synchronization Type

      • Manual: You need to manually start data synchronization.
      • Timed wait when synchronization starts: Period from the time a synchronization starts to the time the next synchronization starts. If this period is shorter than the synchronization time, complete the current synchronization before starting the next one.
      • Timed wait when synchronization ends: Period from the time a synchronization ends to the time the next synchronization starts.
      • Specify the time policy: Synchronization starts at a defined time point.
        • Daily: Synchronization starts at a defined time point every day.
        • Hourly: Synchronization starts at a defined time point every hour.

      Manual

    5. Click Next.
    6. Select the correct remote device, and click Create.
    7. In the dialog box that is displayed, determine whether to associate a consistency group, and then perform the following operations:

      • If you want to associate a consistency group, perform 8.
        NOTE:

        To perform this operation, an existing consistency group must be available. To associate the consistency group, the pair or consistency group must be in suspension state.

      • If you do not want to associate the consistency group, click OK to finish creating the consistency group.

    8. Click here.
    9. Select a consistency group for association and click OK.
    10. Associate the consistency group as prompted.
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Updated: 2019-01-17

Document ID: EDOC1100044928

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