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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 Consistency Group Information

Viewing Consistency Group Information

By performing this operation, you can view information about existing consistency groups, including basic information and remote replication pair information, so that you can effectively monitor the status of consistency groups.

Context

  • On the consistency group management page, you can click Refresh to refresh consistency group information.
  • On the consistency group management page, you can click Keyword and enter keywords to search for the desired consistency group information.
  • On the consistency group management page, you can click and select the information items you want to view.

Procedure

  1. Log in to DeviceManager.
  2. Choose Data Protection > Remote Replication > Remote Replication Consistency Group.
  3. View basic information about existing consistency groups. Table 3-25 describes the related parameters.

    Table 3-25 Parameters of Consistency Group

    Parameter

    Description

    Name

    Name of a consistency group.

    ID

    ID of a consistency group.

    Health Status

    Indicates whether the consistency group is functioning normally. The values include:

    • Normal: The consistency group is functioning normally. You can perform the synchronization operation.
    • Fault: The consistency group malfunctions or the replication link is down, you cannot perform the synchronization operation.

    Running Status

    Indicates the consistency group is running properly. The values include:

    • Normal: Consistency group has completed synchronization successfully.
    • Synchronizing: Pair is synchronizing data.
    • Split: Consistency group 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 consistency group enters this status. You need to manually start synchronization for the consistency group to synchronize data.
    • Invalid: Consistency group is useless and cannot be restored in this status, except deleting it. You must delete the consistency group on both primary and secondary storage devices. Otherwise, the consistency group creation may fail.

    Replication Mode

    Data replication mode of the consistency group. 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.

    Role

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

    Recovery Policy

    After the remote replication internal I/O error is rectified or the replication link is up, the consistency group automatically synchronizes data or not. The values include:

    • Manual: The consistency group enters the To be recovered state. You need to manually synchronize the data from the primary resource to the secondary resource.
    • Automatic: The consistency group enters the Synchronizing state. The system will automatically synchronize the data from the primary resource to the secondary resource.

    Speed

    Rate of data synchronization of the consistency group. 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 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.

    Synchronization Method

    Mode of data synchronization of the consistency group. This parameter is available only when Replication Mode is set to Asynchronous. The values include:

    • Manual: Data synchronization needs to be performed 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 a synchronization operation is completed. When the time indicated by Interval has elapsed, the system starts synchronizing data again.

    Interval

    Waiting time for the two synchronization methods: Timed wait after synchronization begins and Timed wait after synchronization ends.

    Link Compression

    During data synchronization for the consistency group, 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.

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

    Sync Start Time

    Start time of data synchronization of primary and secondary resources.

    Sync End Time

    End time of data synchronization of primary and secondary resources.

    vStore ID

    ID of the vStore to which the remote replication consistency group belongs.

    NOTE:

    This parameter applies to V500R007C20 and later versions.

    Remote vStore ID

    ID of the vStore to which the remote resource of the remote replication consistency group belongs.

    DR Star ID

    ID of the owning DR Star.

    NOTE:

    This parameter applies to V500R007C20 and later versions.

  4. Click the desired consistency group and view its remote replication information. The following Table 3-26 describes the related parameters.

    Table 3-26 Parameters of a remote replication pair

    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 the remote device.

    Remote Device SN

    Serial No. of the remote device.

    Pair ID

    ID of a remote replication pair.

    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 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.

    Remote Replication 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.
    NOTE:

    File system is only supported by asynchronous remote replication.

    Recovery Policy

    A recovery policy supports the following recovery modes:

    • Manual: The remote replication pair enters the To be recovered state. Remote replication must manually synchronize the data from the primary resources to the secondary resources.
    • Automatic: The remote replication pair enters the Synchronizing state. The system will automatically synchronize the incremental data from the primary resources to the secondary resources in the remote replication.

    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.

    Link Compression

    Data compression transmission or not during primary and secondary resource synchronization. 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.

    Status of Secondary Resource Protection

    The values are as follows:

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

    Time Difference

    Synchronization time difference between the primary and secondary storage systems.

    • 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.

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Updated: 2019-07-11

Document ID: EDOC1000181492

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