DR Testing in the DR Center

Prerequisites

• The production center communicates with the same-city/remote DR center properly.
• At least one recovery plan has been created on eReplication.
• For details about requirements on storage licenses for the tested recovery plan, see Checking License Files.
• If application data is automatically replicated by storage instead of being periodically replicated based on the schedule specified upon the protected group creation, the data replication must be stopped before you start the DR test to prevent possible test failures. You can use either of the following methods to stop storage-based replication on the device management software:
  • When the remote replication pair for the protected applications is in the synchronized state and the data is consistent, split the remote replication pair to temporarily stop data replication.
  • Change the remote replication policy to manual synchronization for the protected applications.
• If the information about storage devices, hosts, or VMs is modified at the production or DR site, manually refresh the information. For details, see Refreshing Resource Information.
• Before testing and clearing a protected group whose protection type is database, ensure that all database connections at the DR site are disconnected.

Context

Data testing in the DR center is used to verify data availability.

You are advised to configure LUN-based protection policies for other applications to enable automatic test configuration on the storage system. For this purpose, you need to manually or use self-defined scripts to start and test applications.

In the DR test, snapshots at the DR site can be mapped only to initiators.

Procedure

1. Log in to Fibre Channel switches one by one, check the information about each Fibre Channel port, and calculate the BER. If the BER is larger than 0.1%, check links and rectify link faults.

   BER = Total number of errors/(In bytes + Out bytes) x 100%

   

   A large BER may result in a remote replication failure in a specified window or an unexpected remote replication disconnection.

   

2. Log in to the eReplication DR management server in the same-city or remote DR center.
3. Test a recovery plan.
   1. On the menu bar, select Utilization > Data Restore.
   2. Select the recovery plan to be tested, and click Test in the Operation area.
   3. Perform different operations for different protected objects.
      

      If Huawei UltraPath has been installed on the Linux-based DR host, ensure that I/O suspension time is not 0 and all virtual devices generated by UltraPath have corresponding physical devices. For details, see the OceanStor UltraPath for Linux xxx User Guide.

      • If the type of protected objects is LUN, perform the following operations:
        1. Select DR Site.
        2. Select Available DR Hosts or Host Groups (This operation is optional when the protected object type is LUN).
           

           • If the storage array used at the DR site is T series V2 or later, the to-be-recovered host selected by a user can belong to only one host group on the storage array, and the host group can belong to only one mapping view. Moreover, the storage LUN used by protected applications and its corresponding secondary remote replication LUNs must belong to one LUN group, and the LUN group must reside in the same mapping view as the host group. If the storage array version is T series V2R2, deselect Enable Inband Command to change the mapping view attribute after the mapping view is created.
           • If the storage array is T series V2R2 or later, or 18000 series, automatic host adding and storage mapping are provided. Ensure that the storage is connected to hosts' initiators properly. In this manner, the system can automatically create hosts, host groups, LUN groups, and mapping views on the storage. The creation principles are as follows:

             

        3. Click Test.
        4. In the Warning dialog box that is displayed, read the content of the dialog box carefully and select In the Warning dialog box that is displayed, read the content of the dialog box carefully and select I have read and understood the consequences associated with performing this operation.
        5. Click OK.

4. After a test is complete, verify that applications are started in the remote DR center.

   Verify that applications are started and accessed successfully. If an application fails to be started or cannot execute read and write operations, contact Huawei technical support.

   • If the protection policies are based on applications, check whether the applications are started successfully and data can be read and written correctly.
   • If the protection policies are based on LUNs, log in to the application host in the DR center, scan for disks, and start applications. Then check whether the applications are started successfully and data can be read and written correctly.
   

   You can use self-developed scripts to scan for disks, start applications, and test applications.

5. Clear the test data generated at the DR site and restore resources to the status before the test, to facilitate future DR or planned migration.
   

   • Programs and files on the file systems have been closed before the clearing is performed for protected groups of the local file system type.
   • If the information about storage devices, hosts, or VMs is modified at the production or DR site, manually refresh the information. For details, see Refreshing Resource Information.
   1. Select the recovery plan whose data needs to be cleared, and click More > Clear on the Operation list.
   2. Click OK.