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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 a Synchronous Remote Replication

Creating a Synchronous 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 Synchronous.
    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. From the Remote device drop-down list, select the remote device where the secondary LUN resides.

      NOTE:

      If no remote device exists, click Add to add one.

    3. In the secondary LUN area, select the desired secondary 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 synchronous remote replication.
    1. From the Speed drop-down list, select the desired speed for synchronizing data from the primary LUN to the secondary LUN.

      • 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. (default value)
      • 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.

    2. In Recovery policy drop-down list, select after the remote replication internal I/O error is rectified or the replication link is up, whether the remote replication pair automatically synchronizes data or not.

      • 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)

    3. Select the initial synchronization method of the remote replication.

      • 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. (default value)
      • 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.

    4. Optional: Select Enable the I/O timeout threshold for the secondary LUN and set Timeout Threshold (second).

      NOTE:
      If the data is not written into the secondary LUN successfully after the timeout you set, the remote replication pair enters the Interrupted status.

      The value range of timeout is 10 to 30 seconds. The default value is 30 seconds.

    5. Click Next.
  5. Optional: Create a consistency group of remote replication.
    1. Select Create a consistency group and add pairs to it.
    2. Set Name and Description of the consistency group.
    3. Click Next.

      NOTE:

      You cannot set Timeout Threshold (second) when creating consistency groups. After the remote replication is added to a consistency group, it inherits the configuration of the consistency group.

  6. Confirm the remote replication creation.
    1. Click Next and 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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