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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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Viewing Consistency Group Information

Viewing Consistency Group Information

This operation enables you to 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.

The running status of a consistency group is the same as Pair Running Status of the remote replications added to the consistency group. Only remote replications whose Pair Running Status is Split can be added to a consistency group. When the status of any of the remote replication members contained in a consistency group changes in to Split, the status of the remaining members also changes accordingly.

Procedure

  1. Go to the consistency group management page.
    1. On the right navigation bar, click .

      The data protection page is displayed.

    2. In the left function pane, click Remote Replication.
    3. Click the Remote Replication Consistency Group tab.

      The consistency group management page is displayed.

  2. View information about an existing consistency group. Table 4-22 describes the parameters of a consistency group.

    Table 4-22  Consistency group parameters

    Parameter

    Description

    Setting

    Name

    Name of a consistency group.

    [Example]

    ConsistentGroup001

    ID

    ID of a consistency group.

    [Example]

    00E0F0000050000

    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.

    [Example]

    Normal

    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.

    [Example]

    Normal

    Replication Mode

    Data replication mode of the consistency group. The values include:
    • Synchronous: When data is written on a primary LUN, the write request is also sent to the secondary LUN. Only after the data is written on both the primary and secondary LUNs successfully, does the host receive a successful data write message. Synchronous mode ensures that the data on the primary LUN and secondary LUN synchronize in real-time.
    • Asynchronous: When data is written on a primary LUN successfully, the host receive a successful data write message. In the meanwhile, the primary site records the data difference between the written data and the secondary LUN. In the data synchronization later, only the different data the primary site records are synchronized to the secondary site, reducing the write latency of application server to the minimum.

    [Example]

    Synchronous

    Role

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

    [Example]

    Primary

    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 LUN to the secondary LUN.
    • Automatic: The consistency group enters the Synchronizing state. The system will automatically synchronize the data from the primary LUN to the secondary LUN.

    [Example]

    Automatic

    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 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]

    Medium

    Synchronization Method

    Mode of data synchronization for consistency group. The values include:
    • Manual: Data synchronization needs to be performed manually.
    • 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 a synchronization operation is completed. When the time indicated by Interval has elapsed, the system starts synchronizing data again.

    [Example]

    Manual

    NOTE:

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

    Interval

    Waiting time for the two synchronization methods, Timed wait when synchronization begins and Timed wait when synchronization ends.

    [Value range]

    • Integer from 1 to 1440 (minutes)
    • Integer from 10 to 59 (seconds)

    [Example]

    50 minutes

    NOTE:

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

  3. Click a consistency group to view information about its remote replications. Table 4-23 describes the parameters of a consistency group.

    Table 4-23  Remote replication parameters

    Parameter

    Description

    Value

    Local LUN Name

    Name of a local LUN.

    [Example]

    LUN001_001

    Local LUN ID

    ID of a local LUN.

    [Example]

    2

    Remote LUN Name

    Name of a remote LUN.

    [Example]

    memlunName01

    Remote LUN ID

    ID of a remote LUN.

    [Example]

    42

    Remote Device Name

    Name of the remote device.

    [Example]

    testname01

    Remote Device SN

    Serial No. of the remote device.

    [Example]

    210235G6LLZ0B8000005

    Pair ID

    ID of the remote replication pair.

    [Example]

    200bc71fa9c20000

    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.

    [Example]

    Normal

    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.

    [Example]

    Normal

    Remote Replication Consistency Group

    Name of the owning consistency group of the remote replication.

    [Example]

    ConsistentGroup001

    Replication Mode

    Mode of the data replication. The values include:
    • Synchronous: When data is written on a primary LUN, the write request is also sent to the secondary LUN. Only after the data is written on both the primary and secondary LUNs successfully, does the host receive a successful data write message. Synchronous mode ensures that the data on the primary LUN and secondary LUN synchronize in real-time.
    • Asynchronous: When data is written on a primary LUN successfully, the host receive a successful data write message. In the meanwhile, the primary site records the data difference between the written data and the secondary LUN. In the data synchronization later, only the different data the primary site records are synchronized to the secondary site, reducing the write latency of application server to the minimum.

    [Example]

    Synchronous

    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 LUNs to the secondary LUNs.
    • Automatic: The remote replication pair enters the Synchronizing state. The system will automatically synchronize the incremental data from the primary LUNs to the secondary LUNs in the remote replication.

    [Example]

    Automatic

    Primary LUN Data Status

    Status of data on the primary LUNs.

    [Example]

    Consistent

    Secondary LUN Data Status

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

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

    [Example]

    Consistent

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Updated: 2019-01-28

Document ID: EDOC1000077758

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