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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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Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document. Note: Even the most advanced machine translation cannot match the quality of professional translators. Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).
DR

DR

If the production center malfunctions, use the DR center to take over services from the production center. After the production center is recovered, switch the services back to the production center.

If a disaster occurs in the production center, perform the following operations for the DR center to take over services:

  1. Perform splitting operations on the storage system in the DR center.
    NOTE:

    If the splitting fails, it may be caused by a replication link fault or a failure on the storage system in the production center. A splitting failure does not affect subsequent operations.

  2. Set the secondary resource protection status to readable and writable on the DR storage system.

  3. Map the secondary LUN to the standby host.
    NOTE:

    Be aware that you cannot map primary and secondary LUNs to a same host; otherwise, a conflict may occur on the host, resulting in service interruption.

  4. Run services on the secondary host in the DR center.

After the production center is recovered, perform the following operations to switch the services back to the production center if synchronous remote replication is configured:

  1. Check whether the remote replication pair or consistency group is in the split state.
    1. If yes, go to the next step.
    2. If no, perform splitting and then go to the next step.

  2. Perform a primary/secondary switchover.
    NOTE:

    Before the switchover: the production center is the primary site and the DR center is the secondary site.

    After the switchover: the production center is the secondary site and the DR center is the primary site.

  3. Set the secondary resource protection status to read-only.
    NOTE:

    During this operation, production hosts cannot be accessed. Before performing this operation, ensure that services on the production hosts can be suspended and suspend them.

  4. Start synchronization.
    NOTE:

    This operation synchronizes data from the DR center to the production center. Before performing this operation, ensure that data in the production center can be overwritten.

  5. After data synchronization is complete, delete the mapping between the secondary host and the storage system.
    NOTE:

    During this operation, hosts in the DR center cannot be accessed. Before performing this operation, ensure that host services in the DR center have been stopped.

  6. Perform a primary/secondary switchover.
    NOTE:

    Before the switchover: the production center is the secondary site and the DR center is the primary site.

    After the switchover: the production center is the primary site and the DR center is the secondary site.

  7. Run services on the production host.

After the production center is recovered, perform the following operations to switch the services back to the production center if asynchronous remote replication is configured:

  1. Check whether the remote replication pair or consistency group is in the split state.
    1. If yes, go to the next step.
    2. If no, perform splitting and then go to the next step.

  2. Perform a primary/secondary switchover.
    NOTE:

    Before the switchover: the production center is the primary site and the DR center is the secondary site.

    After the switchover: the production center is the secondary site and the DR center is the primary site.

  3. Set the secondary resource protection status to read-only.
    NOTE:

    During this operation, production hosts cannot be accessed. Before performing this operation, ensure that services on the production hosts can be suspended and suspend them.

  4. Start synchronization.
    NOTE:

    This operation overwrites data in the production center using data in the DR center. Before performing this operation, ensure that data in the production center can be overwritten.

  5. After data synchronization is complete, delete the mapping between the secondary host and the storage system.
    NOTE:

    During this operation, hosts in the DR center cannot be accessed. Before performing this operation, ensure that host services in the DR center have been stopped.

  6. Manually start incremental synchronization to copy data from the DR storage system to the production storage system and ensure data consistency between the storage systems.

  7. Perform splitting.

  8. Set the secondary resource protection status to readable and writable.

  9. After data replication is complete, perform a primary/secondary switchover on the production storage system.
    NOTE:

    Before the switchover: the production center is the secondary site and the DR center is the primary site.

    After the switchover: the production center is the primary site and the DR center is the secondary site.

  10. Set the secondary resource protection status to read-only.

  11. Start synchronization.
    NOTE:

    Data is synchronized from the production center to the DR center. After synchronization, pair running status returns to normal.

  12. Run services on the production host.
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Updated: 2019-07-11

Document ID: EDOC1000181492

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