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HyperReplication Feature Guide for Block

OceanStor V5 Series V500R007

This document is applicable to OceanStor 5110 V5, 5110F V5, 5300 V5, 5300F V5, 5500 V5, 5500F V5, 5600 V5, 5600F V5, 5800 V5, 5800F V5, 6800 V5, 6800F V5, 18500 V5, 18500F V5, 18800 V5, and 18800F V5. It describes the working principle and application scenarios of the HyperReplication feature (for block). Also, it explains how to configure and manage the feature.
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Modifying the Properties of a Remote Replication Pair

Modifying the Properties of a Remote Replication Pair

By performing this operation, you can 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 to a consistency group cannot be modified.

NOTE:

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

Procedure

  1. Log in to DeviceManager.
  2. Choose Data Protection > Remote Replication > Remote Replication Pair.
  3. Select the remote replication pair you want to modify and click Properties.

    The Properties of Remote Replication Pair dialog box is displayed.

  4. Modify properties of the remote replication pair. Table 3-19 describes related parameters.

    Table 3-19 Remote replication pair parameters

    Parameter

    Description

    Value

    Status of Secondary Resource Protection

    Status of secondary resource protection. The value can be:

    • Read-only

      Data of the secondary LUN is only readable.

    • Read/Write

      Data of the secondary LUN is readable and writable.

    [Example]

    Read-only

    NOTE:

    You can set the secondary resource protection data status in the following conditions:

    • Pair Running Status is Split and Secondary Resource Data Status is Consistent.
    • Pair Running Status is Interrupted (link down) and Secondary Resource Data Status is Consistent. In this condition, the status can only be set in the secondary storage system.

    Synchronization Method

    Way of synchronizing data between the primary and secondary resources. The value can be:

    • Manual

      A user needs to manually synchronize data from the primary resource to the secondary resource.

    • Timed wait after synchronization begins

      The system starts timing as soon as a synchronization begins. When the time specified in Interval has elapsed, the system automatically starts to synchronize data between the primary resource and secondary resource 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 after synchronization ends

      The system starts timing as soon as a synchronization ends. When the time specified in Interval has elapsed, the system automatically starts to synchronize data between the primary resource and secondary resource 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 after synchronization begins and Timed wait after synchronization ends.

    NOTE:

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

    Speed

    Speed of data synchronization. The value can be:

    • 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 a relatively short period. This value is applicable to scenarios where the service load is relatively 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 pair to recover after the storage system recovers from a failure. The value can be:

    • Manual

      The maintenance personnel must manually synchronize data from the primary resource to the secondary resource.

    • Automatic

      The system will automatically synchronize the data from the primary resource to the secondary resource.

    [Example]

    Automatic

    Link Compression

    During data synchronization between the primary and secondary resources, data is compressed or not. If you select data compression, the bandwidth pressure of replication links is reduced and the replication performance is improved. The value can be:

    • Compression
    • No compression
    NOTE:
    • When Compression Status of the remote device is Invalid, do not set Link Compression to Compression. Otherwise, modifying the properties of the pair will fail.
    • Choose Data Protection > Remote Device, and click Modify to view the Compression Status of the remote device.

    [Example]

    No compression

    NOTE:

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

    Set 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)

    Timeout for data written into the secondary LUN.

    [Value range]

    10 to 30

    [Default value]

    30

    NOTE:

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

  5. Confirm the property modification of the remote replication pair.

    1. Click OK.

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

    2. Click Close.

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Updated: 2019-07-11

Document ID: EDOC1000181492

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