Creating a DR Star Trio Using Pairs

Prerequisites

• The storage systems at the three sites are communicating with each other properly.
• A HyperMetro pair has been created between storage system A and storage system B. A remote replication pair has been created between storage system A and storage system C, and between storage system B and storage system C. One of the two remote replication pairs must be in the standby state.

  To set a standby remote replication pair, click Advanced on the Configure Protection page for creating a remote replication pair and select Yes for Standby.

• The local resources of the HyperMetro pair are the primary resources of the active asynchronous remote replication pair. The remote resources of the HyperMetro pair are the primary resources of the standby asynchronous remote replication pair. The active and standby asynchronous remote replication pairs share secondary resources.
• Health Status of the HyperMetro and asynchronous remote replication pairs is Normal.

Context

Create a DR Star trio on the local HyperMetro device.

The remote replication pair containing the local HyperMetro device is in the active state, and the other remote replication pair is in the standby state.

Procedure

1. Choose Data Protection > Protection Entities > LUNs.
2. Select the DR Star Trios tab and choose Create > Create by Pair.

   The Create DR Star Trio page is displayed on the right.

3. Select a HyperMetro domain and asynchronous remote replication remote device.
   1. In the HyperMetro Domain drop-down list, select a HyperMetro domain.

      You can click Create next to the drop-down list to create a HyperMetro domain.

   2. In the Remote Device in Async Remote Replication drop-down list, select an asynchronous remote replication remote device.

      You can click Add next to the drop-down list to add a new remote device.

4. Click Configure next to DR Star Trios.

   The Select Pair page is displayed.

   1. Select a HyperMetro pair, local asynchronous remote replication pair, and remote asynchronous remote replication pair, and then click Add to DR Star Trio.

      The selected HyperMetro pair and two asynchronous remote replication pairs are added to the DR Star Trios list.

      Ensure that one of the selected asynchronous remote replication pair is in the Standby state and the other one is not in the Standby or Invalid state.

   2. In the Name column, set the name of the DR Star trio.
      • The name must be unique.
      • The name contains letters, digits, underscores (_), periods (.), and hyphens (-), and must start with a letter or digit.
      • The name can contain 1 to 31 characters.
   3. Click OK.

5. Click Advanced in the upper right corner and configure DR Star trio parameters based on service requirements.

   Table 3-15 describes the parameters.

   Table 3-15 DR Star trio parameters

   Parameter	Description
   Switchover Policy	Policy of switching the status of the two asynchronous remote replication pairs between Normal and Standby when a fault occurs Possible values are as follows: Manual: When a fault occurs, you need to manually switch the status of the two asynchronous remote replication pairs to rectify the fault. Automatic: When a fault occurs, the storage system automatically switches the status of the two asynchronous remote replication pairs based on specific fault conditions.
   Switchover Silent Time (Minutes)	When Switchover Policy is set to Automatic and a fault occurs, the storage system will automatically switch the status of the two asynchronous remote replication pairs if the fault persists after the switchover silent time expires. If the fault is rectified before the switchover silent time expires, the storage system will not perform the switchover. NOTE: This parameter is available only when Switchover Policy is set to Automatic.

6. Click OK.

   Confirm your operation as prompted.