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Starting replication

The Start Replication task enables you to start replication to a specific Secondary in an RDS. Review the three types of attach options to determine the one suitable for your VVR configuration.

• Autosync Attach
• Checkpoint Attach
• Force Attach

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    Note   The example in this section shows how to start replication using the autosync attach option.

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Using autosync attach

Use the Autosync attach option when the data volumes contain valid data and the application is either active or inactive. The Autosync attach option copies the data on the Primary to the Secondary over the network using the DCM mechanism. This DCM mechanism requires that each data volume in the Primary RVG have a DCM associated with it.

Using checkpoint attach

The Checkpoint attach option is useful for low bandwidth networks or very large data sets. If you do not want to use the network to transfer the data, use checkpoint attach to backup the data on the Primary, and restore it on the Secondary. Use this option to synchronize the Secondary when the data volumes contain valid data and the application is either active or inactive.

Using force attach

Use the Force attach option to start replication only when the Primary and Secondary data volumes have identical data and the application is inactive.

  Caution   Use Force attach with care. As mentioned, use this option only when the Primary and Secondary data volumes have identical data and the application is inactive.

For details, see Starting replication when the data volumes are zero initialized.

 To start replication using the autosync attach option

1. Choose Replication Tasks > Start Replication.

   The Start Replication screen displays.

2. Select the RVG from the list.

   displays the names of the RVG and disk group in the RVG Name and Disk Group name fields.

3. In the Secondary Host entry field, enter the Secondary host name. If only one Secondary exists in the RDS, the name of the Secondary host is displayed in this field.
4. Select the type of attach. To display and select the type of attach from the list, press tab in the Type of Attach field until the required setting displays. In this example, autosync attach has been selected.

   The following screen displays:

Click the thumbnail above to view full-sized image.

5. If you specified Checkpoint attach, enter the checkpoint name in the Checkpoint Name entry field.
6. To initiate this task, press enter.

   The command status screen displays:

Click the thumbnail above to view full-sized image.

7. Press F3 until you return to the main menu.