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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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Viewing Information of Remote Replication Pairs

Viewing Information of Remote Replication Pairs

By performing this operation, you can view information about existing remote replication pairs so that you can effectively monitor the status of the remote replication pairs.

Procedure

  1. Log in to DeviceManager.
  2. Go to the remote replication pair page.

    The operation path varies with user types:

    • System user: Click vStore, select the desired vStore, and click Details to go to the vStore view. Choose Data Protection > Remote Replication > Remote Replication Pair.
    • vStore user: In the vStore view, choose Data Protection > Remote Replication > Remote Replication Pair.

  3. View the information about remote replication pairs. Table 4-11 describes related parameters.

    NOTE:

    On the remote replication management page, you can do the following:

    • Click and select the pair information items you want to view.
    • Click Refresh to refresh remote replication pair information.
    • Enter keywords to search for the desired remote replication pair information.
    Table 4-11 Remote replication parameters

    Parameter

    Description

    Local Resource Name

    Name of a local resource.

    Local Resource ID

    ID of a local resource.

    Remote Resource Name

    Name of a remote resource.

    Remote Resource ID

    ID of a remote resource.

    Remote Device Name

    Name of a remote device.

    Remote Device SN

    SN of a remote device.

    Pair ID

    ID of a remote replication pair.

    Role

    The local resource of the remote replication pair is the primary resource or not. If the local resource is the primary resource, it displays as Primary. Otherwise, it displays as Secondary.

    Pair Health Status

    Indicates whether the remote replication pair is functioning normally. The values include:

    • Normal: The pair is functioning normally. You can perform the synchronization operation.
    • Fault: The primary resource or secondary resource of the pair malfunctions or the replication link is down, you cannot perform the synchronization operation.

    Pair Running Status

    Indicates whether the remote replication pair is running properly. The values include:

    • Normal: Pair has completed synchronization successfully.
    • Synchronizing: Pair is synchronizing data.
    • Split: Pair is in the split status, and the synchronization is suspended.
    • Interrupted: The remote replication internal I/O error or the replication link is down, and you cannot perform the synchronization operation temporarily.
    • To be recovered: After the remote replication internal I/O error is rectified or the replication link is up, and if Recovery Policy is Manual, the pair enters this status. You need to manually start synchronization for the pair to synchronize data.
    • Invalid: The pair is useless and cannot be restored in this status, except deleting it. You must delete the pair on both primary and secondary storage devices. Otherwise, the pair creation may fail.
    NOTE:

    When the running status of a remote replication pair is Synchronizing, the progress bar is displayed on the GUI to indicate the current synchronization progress. The progress may suddenly change, which is a normal phenomenon.

    Time Remaining for Synchronization

    Time required for synchronization to complete.

    Consistency Group

    Name of the owning consistency group of the remote replication pair.

    Replication Mode

    Mode of the data replication. The values include:

    • Synchronous: When data is written on a primary resource, the write request is also sent to the secondary resource. Only after the data is written on both the primary and secondary resources successfully, does the host receive a successful data write message. Synchronous mode ensures that the data on the primary resource and secondary resource is synchronized in real time.
    • Asynchronous: When data is written to the primary resource successfully, the host receives a successful data write message. In the meanwhile, the primary site records the data difference between the written data and data on the secondary resource. In the data synchronization later, only the different data recorded by the primary site is synchronized to the secondary site, reducing the write latency of application server to the minimum.

    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 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.

    Primary Resource Data Status

    Status of data on the primary resource. The values include:

    • Synchronized: only applies to synchronous remote replication to indicate that the data synchronization of primary and secondary resources has been completed. In the asynchronous remote replication, after data synchronization of primary and secondary resources has been completed, the data status of the primary resource is Consistent.
    • Consistent: data status of the primary resource. In normal states, it is Consistent.

    Secondary Resource Data Status

    Status of the secondary resource. The data status between the primary resource and secondary resource includes:

    • Synchronized: Data in the secondary resource is the same as that in the primary resource. Data availability is the highest.
    • Consistent: Data in the secondary resource is a duplicate of the data in the primary resource (at the time the latest successful synchronization starts). In this state, data in the secondary resource is available but not necessarily the same as the current data in the primary resource.
    • Inconsistent: Data in the secondary resource is not a duplicate of the data in the primary resource (at the current point in time or at the time the previous synchronization is ended). In this state, data in the secondary resource is unavailable. You can synchronize the data to ensure data consistency between the primary resource and secondary resource.
    NOTE:

    Synchronized is only applied for synchronous remote replication.

    Status of Secondary Resource Protection

    The data status of secondary resource protection includes:

    • Read-only: Data of the secondary LUN is only readable.
    • Read/Write: Data of the secondary LUN is readable and writable.

    Link Compression

    During primary and secondary resource synchronization, data is compressed or not. If it is data compression transmission, replication links are with lower bandwidth pressure, while improving the replication performance. The values include:

    • Compression
    • No compression
    NOTE:

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

    Compression Status

    If the status displays as Valid, indicating data compression transmission is available for the remote replication. If the status displays as Invalid, indicating data compression transmission is not available or data compression transmission is not selected for the remote replication.

    Time Difference

    Synchronization time difference between the primary and secondary storage systems. This field is displayed only in asynchronous replication scenarios and when Pair Running Status is Normal or Synchronizing.

    • When Pair Running Status is Normal, this field indicates the time difference between the current time and the start time of the current replication.
    • When Pair Running Status is Synchronizing, this field indicates the time difference between the current time and the start time of last replication.

    Remote Replication vStore Pair ID

    ID of the vStore pair to which the secondary resource belongs.

    This parameter is invalid only when the secondary resource is a file system of a vStore pair.

    Replication Type

    Replication type of the remote replication pair. The values include:

    • Remote replication
    • Local replication
    NOTE:

    This parameter applies to V500R007C20 and later versions.

    DR Star ID

    ID of the owning DR Star.

    NOTE:

    This parameter applies to V500R007C20 and later versions.

  4. Click a remote replication pair. The information of the remote replication pair is displayed in graphic style. Table 4-12 lists the parameters.

    Table 4-12 Parameters of a remote replication pair

    Parameter

    Description

    Synchronization Method

    Method to synchronize data from the primary resource to the secondary resource. The values include:

    • Manual: The synchronization operation must be carried out manually.
    • Timed wait after 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 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 the latest synchronization ends. When the time specified in Interval has elapsed, the system starts to synchronize data again.
    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.

    Time Policy

    The system automatically synchronizes data between the primary file system and secondary file system based on a specified time policy.

    • Hourly: Specifies when data synchronization begins in every hour. Its value is an integer ranging from 0 to 59.
    • Daily: Specifies when data synchronization begins in every day. Its value ranges from 00:00 to 23:59.
    • Weekly: Specifies when data synchronization begins in every week. Its value ranges from Monday to Sunday and 00:00 to 23:59.
      NOTE:

      This parameter is valid only when Synchronization Method is set to Specify the time policy.

    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.

    Synchronization Progress

    Progress of synchronizing data between the primary resource and secondary resource.

    NOTE:

    The synchronization progress is indicated by an arrow between the primary resource and secondary resource. Only remote replication of LUNs needs the parameter.

    Sync Start Time

    Time when a remote replication task is started.

    Sync End Time

    Time when a remote replication task is complete.

    Time Remaining for Synchronization

    Time required for synchronization to complete.

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Updated: 2019-07-11

Document ID: EDOC1000181492

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