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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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Modifying the Properties of a Remote Replication Pair

Modifying the Properties of a Remote Replication Pair

This operation enables you to change the synchronization type, speed, and recovery policy of a remote replication pair.

Precautions

The properties of the remote replication pair that has been added into the consistency group cannot be modified.

NOTE:
After the remote replication pair has been added into the consistency group, the remote replication pair will function according to the replication properties of the consistency group (the properties are Recovery Policy, Speed, Synchronization Method, and Interval), and is not relevant to the properties of the pair.

Procedure

  1. Go to the Remote Replication Properties dialog box.
    1. On the right navigation bar, click .
    2. In the left function pane, click Remote Replication.
    3. Click the Remote Replication tab.

      The remote replication management page is displayed.

    4. Select the remote replication you want to modify and click Properties.

      The Properties of Pair dialog box is displayed.

  2. Modify properties of the remote replication. Table 4-15 describes related parameters.

    Table 4-15  Remote replication parameters

    Parameter

    Description

    Value

    Synchronization Method

    Way of synchronizing data between the primary and secondary LUNs.
    • Manual: A user needs to manually synchronize data from the primary LUN to the 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.

    [Example]

    Manual

    NOTE:

    This parameter is available only when Replication Mode is set to Asynchronous.

    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.
    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.

    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.

    [Example]

    High

    Recovery Policy

    Policy applied by a remote replication to recover after the storage system recovers from a failure. The value can be Manual or Automatic.
    • Manual: The maintenance personnel must manually synchronize data from the primary LUN to the secondary LUN.
    • Automatic: The system will automatically synchronize data from the primary LUN to the secondary LUN.

    [Example]

    Automatic

    Enable the I/O timeout threshold for the secondary LUN

    If data is written into the primary LUN but fails to be written into the secondary LUN when the timeout period you set has elapsed, the remote replication pair enters the Interrupted status.

    [Default value]

    Disabled

    NOTE:

    This parameter is available only when Replication Mode is set to Synchronous.

    Timeout Threshold (second)

    The timeout for data written into the secondary LUN.

    [Value range]

    10 to 30

    [Default value]

    30

    NOTE:

    This parameter is available only when Enable the I/O timeout threshold for the secondary LUN is selected.

  3. Confirm the remote replication modification.
    1. Click OK.

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

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

Document ID: EDOC1000077758

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