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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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Creating an Asynchronous Remote Replication

Creating an Asynchronous Remote Replication

Creating a remote replication includes the following operations: configuring basic information about the remote replication, selecting a primary LUN and a secondary LUN, and setting remote replication properties. You can proceed as prompted.

Prerequisites

  • The remote replication license is valid.
  • The local and remote storage devices must support remote replication.
  • The remote storage device is added already, and the secondary resource is created on the remote device.
  • The capacity of a primary is the same as that of a secondary LUN.
  • The states of primary and secondary LUNs are healthy.
  • The primary and secondary LUNs have not configured any feature that conflicts with the remote replication feature.

Precautions

Do not create remote replications on any of the following LUNs:

  • The snapshot LUN of a snapshot
  • The target LUN of a LUN copy
  • A LUN on which snapshot rollback is being performed
  • The secondary LUN of a clone
  • A LUN mapping to a host can not be a secondary LUN of remote replication
  • The source or target LUN in a SmartMigration task

Procedure

  1. Go to the Create Remote Replication Wizard dialog box.
    1. On the right navigation bar, click .

      The data protection page is displayed.

    2. Click Remote Replication.
    3. Click the Remote Replication tab.

      The remote replication management page is displayed.

    4. Click Create.

      The Create Remote Replication Wizard dialog box is displayed.

  2. Configure basic information about the remote replication.
    1. Set the replication mode of the remote replication to Asynchronous.
    2. Click Next.
  3. Select a primary LUN and a secondary LUN.
    1. In the primary LUN group box, select the desired primary LUN.
    2. In Remote device, select a remote device.
    3. In the secondary LUN group box, select the desired secondary LUN.

      NOTE:

      The capacity of the secondary LUN must be the same as that of the primary LUN.

    4. Click Add to Pairs.

      Add the pair of the primary and secondary LUNs to Pairs.

    5. Click Next.
  4. Set properties of the remote replication pair.
    1. On the Set Properties page, set the remote replication parameters based on your service requirements.

      Table 4-12 describes parameters of remote replication.

      Table 4-12  Parameters of remote replication

      Parameter

      Description

      Value

      Speed

      Speed of data synchronization. The values include:
      • Low: When the speed is set to low, remote replication will take a long time. This value is applicable to scenarios where the service load is heavy. The speed is normally from 0 to 5 MB/s.
      • Medium: When the speed is set to medium, remote replication will take relatively short period. This value is applicable to scenarios where the service load is heavy. The speed is normally from 10 to 20 MB/s.
      • High: When the speed is set to high, remote replication will take a short period. This value is applicable to scenarios where the service load is relatively light. The speed is normally from 50 to 70 MB/s.
      • Highest: When the speed is set to highest, remote replication will be complete in the shortest period. This value is applicable to scenarios where the service load is light. The speed is normally above 100 MB/s.

      [Default value]

      Medium

      Recovery Policy

      After the remote replication internal I/O error is rectified or the replication link is up, the remote replication pair automatically synchronizes data or not. The values include:
      • Manual: The pair enters the To be recovered state. You need to manually synchronize the data from the primary LUN to the secondary LUN in the pair.
      • Automatic: The pair enters the Synchronizing state. The system will automatically synchronize the data from the primary LUN to the secondary LUN in the pair.

      [Default value]

      Automatic

      Synchronization Method

      Mode of data synchronization between the primary LUN and secondary LUN. The values include:

      • Manual: Data must be manually synchronized between the primary LUN and secondary LUN.
      • Timed wait when synchronization begins: The system starts timing as soon as the latest synchronization begins. When the time specified in Interval has elapsed, the system automatically starts to synchronize data between the primary LUN and secondary LUN again.
        NOTE:

        If the latest synchronization is still being executed after the time specified in Interval has elapsed, the data synchronization will start after the latest synchronization finishes.

      • Timed wait when synchronization ends: The system starts timing as soon as the latest synchronization ends. When the time specified in Interval has elapsed, the system automatically starts to synchronize data between the primary LUN and secondary LUN again.

      [Default value]

      Manual

      Interval

      Time spent waiting of the two synchronization methods, Timed wait when synchronization begins and Timed wait when synchronization ends.

      [Value range]
      • The interval is an integer ranging from 1 to 1440 (inclusive), when minutes is used as the unit.
      • The interval is an integer ranging from 3 to 59 (inclusive), when seconds is used as the unit.

      [Default value]

      60, when minutes is used as the unit.

      30, when seconds is used as the unit.

      NOTE:

      This parameter is available when Replication Mode is set to Asynchronous and Synchronization Method is set to Timed wait when synchronization begins or Timed wait when synchronization ends.

      Initial Synchronization

      Mode of initial data synchronization between the primary LUN and secondary LUN. The values include:
      • Data is inconsistent between the primary and secondary LUNs. After a remote replication task is created, the system automatically performs data synchronization.: After the remote replication task is created, the data on the secondary LUN is overwritten immediately. Ensure that the data on the secondary LUN is no longer necessary or has been backed up.
      • Data is inconsistent between the primary and secondary LUNs. After a remote replication task is created, manually perform data synchronization.: After the remote replication task is created, manually synchronize data on the primary and secondary LUNs as soon as possible to ensure data consistency.
      • The data on primary and secondary LUNs is consistent and data synchronization is not required.: Ensure that the data on the primary and secondary LUNs is consistent. If the data is inconsistent, the secondary LUN cannot be used to recover data or take over services from the primary LUN when the primary LUN fails. As a result, data loss and service interruption may occur. This option is not displayed when the LUN type is file system.

      [Default value]

      Data is inconsistent between the primary and secondary LUNs. After a remote replication task is created, the system automatically performs data synchronization.

    2. Click Next.

      The Add Pairs to Remote Replication Consistency Group page is displayed.

  5. Optional: Add the remote replication pair to a newly created consistency group.
    1. Select Create a consistency group and add pairs to it.
    2. Set Name, and Description, of the consistency group.
    3. Click Next.
  6. Confirm the remote replication creation.
    1. View the configuration summary of the remote replication.
    2. Click Finish.

      The Results dialog box is displayed, indicating that the operation succeeded.

    3. Click Close.
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Updated: 2019-01-28

Document ID: EDOC1000077758

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