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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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Creating a Remote Replication Pair

Creating a Remote Replication Pair

Remote replication copies data from a local storage device to a remote storage device for remote DR. Remote replication includes synchronous remote replication and asynchronous remote replication.

Creating a Synchronous Remote Replication Pair

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

Prerequisites
  • The remote replication license is valid.
  • The local and remote storage devices support remote replication.
  • The remote storage device has been added. The secondary LUN has been created on the remote storage device.
  • The capacity of the primary LUN is the same as that of the secondary LUN.
  • The primary and secondary LUNs are in healthy status.
  • The primary and secondary LUNs have not been equipped with any feature that conflicts with the remote replication feature.
Procedure
  1. Log in to DeviceManager.
  2. Choose Data Protection > Remote Replication > Remote Replication Pair.
  3. Click Create.

    The Create Remote Replication Pair dialog box is displayed.

  4. Specify the replication mode and resource type for remote replication.

    1. Set Replication Mode to Synchronous.
    2. Select a primary resource type from the drop-down list.

      Possible values of the primary resource type are LUN, Microsoft Exchange, VMware, Hyper-V, Oracle, and SQL Server.

    3. Optional: When Microsoft Exchange, VMware, Hyper-V, Oracle, or SQL Server is selected as the primary resource type, click Select, select an application instance, and click OK.
      NOTE:

      When you create a remote replication pair using the storage resources created based on an application, all available LUNs of the application are displayed in Primary Resource. For details about how to create storage resources based on applications, see Creating Storage Resources Based on Applications in the OceanStor V5 Series V500R007 Basic Storage Service Configuration Guide for Block. For OceanStor 5000 V5 and 6000 V5 series, you can configure the storage resources created based on applications. For OceanStor 18000 V5 series, the storage resources created based on applications are not displayed when you create a remote replication pair, because this type of storage resources is not supported by OceanStor 18000 V5 series.

    4. Click Next.

  5. Select the primary and secondary resources for synchronous remote replication.

    1. From the Remote device drop-down list, select the remote device where the secondary resource resides.
      NOTE:

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

    2. In the Primary Resource area, select the primary resource.
    3. In the Secondary Resource area, select the secondary resource.
    4. Click Add to Pairs.

      The selected primary and secondary resources are added to Pairs.

    5. Click Next.

  6. Set properties of the remote replication pair.

    1. In the Set Properties dialog box, set synchronous remote replication pair parameters.

      Table 3-8 describes the related parameters.

      Table 3-8 Synchronous remote replication pair parameters

      Parameter

      Description

      Value

      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.

      [Default value]

      Medium

      Recovery Policy

      After an internal I/O error is rectified or the replication link is up, the remote replication pair automatically synchronizes data or not. The value can be:

      • Manual

        The pair enters the To be recovered state. You need to manually synchronize the data from the primary resource to the secondary resource in the pair.

      • Automatic

        The pair enters the Synchronizing state. The system will automatically synchronize the data from the primary resource to the secondary resource in the pair.

      [Default value]

      Automatic

      Initial Synchronization

      This parameter refers to the mode of initial data synchronization between the primary and secondary resources. The value can be:

      • Data is inconsistent between the primary and secondary resources. After the remote replication pair is created, the system automatically performs data synchronization.

        After a remote replication pair is created, the data on the secondary resource is overwritten immediately. Ensure that the data on the secondary resource is no longer necessary or has been backed up.

      • Data is inconsistent between the primary and secondary resources. After the remote replication pair is created, manually perform data synchronization.

        After a remote replication pair is created, manually synchronize data between the primary and secondary resources as soon as possible to ensure data consistency.

      • The data on primary and secondary resources is consistent and data synchronization is not required.

        Ensure that the data on the primary and secondary resources is consistent. If the data is inconsistent, the secondary resource cannot be used to recover data or take over services from the primary resource when the primary resource fails. As a result, data loss and service interruption may occur.

      [Default value]

      Data is inconsistent between the primary and secondary resources. After the remote replication pair is created, the system automatically performs data synchronization.

      Set the I/O timeout threshold for the secondary LUN

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

      [Default value]

      Disable

      Timeout Threshold (second)

      Timeout threshold that data is not written to the secondary LUN successfully.

      [Default value]

      30

    2. Click Next.

  7. Optional: Add the remote replication pair to a newly created consistency group.

    NOTE:

    If Initial Synchronization is set to The data on primary and secondary resources is consistent and data synchronization is not required, the Add Pairs to Remote Replication Consistency Group page will be skipped.

    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 pair is added to a consistency group, it inherits the configuration of the consistency group.

  8. Confirm the creation of the remote replication pair.

    1. View the configuration summary of the remote replication pair.
    2. Click Finish to create the remote replication pair.

      The security alert dialog box is displayed.

    3. Confirm the information in the dialog box. Select I have read and understand the consequences associated with performing this operation. Click OK.

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

    4. Click Close.

Creating an Asynchronous Remote Replication Pair

Creating an asynchronous remote replication pair includes the following operations: configuring basic information about remote replication, selecting a primary resource and a secondary resource, and setting remote replication properties. You can create a remote replication pair as prompted.

Prerequisites
  • The remote replication license is valid.
  • The local and remote storage devices support remote replication.
  • The remote storage device has been added. The secondary LUN has been created on the remote storage device.
  • The capacity of the primary LUN is the same as that of the secondary LUN.
  • The primary and secondary LUNs are in healthy status.
  • The primary and secondary LUNs have not been equipped with any feature that conflicts with the remote replication feature.
Procedure
  1. Log in to DeviceManager.
  2. Choose Data Protection > Remote Replication > Remote Replication Pair.
  3. Click Create.

    The Create Remote Replication Pair dialog box is displayed.

  4. Specify the replication mode and resource type for remote replication.

    1. Set Replication Mode to Asynchronous.
    2. Select a primary resource type from the drop-down list.

      Possible values of the primary resource type are LUN, Microsoft Exchange, VMware, Hyper-V, Oracle, and SQL Server.

    3. Optional: When Microsoft Exchange, VMware, Hyper-V, Oracle, or SQL Server is selected as the primary resource type, click Select, select an application instance, and click OK.
      NOTE:

      When you create a remote replication pair using the storage resources created based on an application, all available LUNs of the application are displayed in Primary Resource. For details about how to create storage resources based on applications, see Creating Storage Resources Based on Applications in the OceanStor V5 Series V500R007 Basic Storage Service Configuration Guide for Block. For OceanStor 5000 V5 and 6000 V5 series, you can configure the storage resources created based on applications. For OceanStor 18000 V5 series, the storage resources created based on applications are not displayed when you create a remote replication pair, because this type of storage resources is not supported by OceanStor 18000 V5 series.

    4. Click Next.

  5. Select the primary and secondary resources for asynchronous remote replication.

    1. From the Remote device drop-down list, select the remote device where the secondary resource resides.
      NOTE:

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

    2. In the Primary Resource area, select the primary resource.
    3. In the Secondary Resource area, select the secondary resource.
    4. Click Add to Pairs.

      The selected primary and secondary resources are added to Pairs.

      NOTE:

      Remote Device Compression Status in the pair list indicates whether the compression algorithms or protocols of both local and remote storage devices match or not.

      • If yes, the status is Valid, indicating data compression transmission is available.
      • If no, the status is Invalid, indicating data compression transmission is not available.

        If the status is Invalid, do not set Link Compression to Compression when setting remote replication pair parameters. Otherwise, remote replication pairs cannot be created.

    5. Click Next.

  6. Set properties of the remote replication pair.

    1. On the Set Properties page, set the remote replication pair parameters based on your service requirements.

      Table 3-9 describes parameters of the remote replication pair.

      Table 3-9 Asynchronous remote replication pair parameters

      Parameter

      Description

      Value

      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.

      [Default value]

      Medium

      Recovery Policy

      After an internal I/O error is rectified or the replication link is up, the remote replication pair automatically synchronizes data or not. The value can be:

      • Manual

        The pair enters the To be recovered state. You need to manually synchronize the data from the primary resource to the secondary resource in the pair.

      • Automatic

        The pair enters the Synchronizing state. The system will automatically synchronize the data from the primary resource to the secondary resource in the pair.

        NOTE:

        For V500R007C30 and later versions, if the write policy of LUNs is write through, remote replication pairs cannot be automatically recovered. Check whether the device has a fault. For details, see alarm 0xF00270038 in the Event Reference specific to your product model.

      [Default value]

      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:

      If Remote Device Compression Status is Invalid, do not set Link Compression to Compression. Otherwise, creating a remote replication pair will fail.

      [Default value]

      No compression

      Synchronization Method

      Mode of data synchronization between the primary resource and secondary resource. The value can be:

      • Manual

        Data must be manually synchronized between the primary resource and 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.

      [Default value]

      Manual

      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.

      [Default value]

      If the unit is minute, the default value is 60 minutes.

      If the unit is second, the default value is 30 seconds.

      Initial Synchronization

      Mode of initial data synchronization between the primary resource and secondary resource. The value can be:

      • Data is inconsistent between the primary and secondary resources. After the remote replication pair is created, the system automatically performs data synchronization.

        After a remote replication pair is created, the data on the secondary resource is overwritten immediately. Ensure that the data on the secondary resource is no longer necessary or has been backed up.

      • Data is inconsistent between the primary and secondary resources. After the remote replication pair is created, manually perform data synchronization.

        After a remote replication pair is created, manually synchronize data between the primary and secondary resources as soon as possible to ensure data consistency.

      • The data on primary and secondary resources is consistent and data synchronization is not required.

        Ensure that the data on the primary and secondary resources is consistent. If the data is inconsistent, the secondary resource cannot be used to recover data or take over services from the primary resource when the primary resource fails. As a result, data loss and service interruption may occur.

      [Default value]

      Data is inconsistent between the primary and secondary resources. After the remote replication pair is created, the system automatically performs data synchronization.

    2. Click Next.

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

  7. Optional: Add the remote replication pair to a newly created consistency group.

    NOTE:

    If Initial Synchronization is set to The data on primary and secondary resources is consistent and data synchronization is not required, the Add Pairs to Remote Replication Consistency Group page will be skipped.

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

      The Summary page is displayed.

  8. Confirm the creation of the remote replication pair.

    1. Check the remote replication pair information. If correct, click Finish.

      The security alert dialog box is displayed.

    2. Read the content in the dialog box carefully, and select I have read and understand the consequences associated with performing this operation.
    3. Click OK.

      The Execution Result page is displayed.

    4. On Execution Result page, check whether remote replication pair is created successfully.
    5. Click Close.

      The details about the remote replication pair will be displayed in the remote replication pair list if the remote replication pair is successfully created.

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Updated: 2019-07-11

Document ID: EDOC1000181492

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