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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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Disaster Recovery

Disaster Recovery

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.

The following introduces operations on a remote replication consistency group. Operations on a remote replication pair are similar.

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 in the production array. Failing to perform the splitting does not affect subsequent operations.



  2. Disable secondary resource protection 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, volume label conflict may occur on the host, causing 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. If yes, go to the next step. If no, perform the splitting before go to the next step.

  2. Perform a primary/secondary switchover for the remote replication.
    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. Enable secondary resource protection.
    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 for the remote replication.
    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. If yes, go to the next step. If no, perform the splitting before go to the next step.

  2. Perform a primary/secondary switchover for the remote replication.
    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. Enable secondary resource protection.
    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. Start synchronization to copy data from the DR storage system to the production storage system and ensure data consistency between the storage systems.

  7. Perform the splitting.

  8. Disable secondary resource protection.

  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. Enable secondary resource protection.

  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: 2019-01-28

Document ID: EDOC1000077758

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