# SDS - Migrating Data (3300 ICP Release 6.x to Release 7.x or later)

If you upgrade 3300 ICP Release 6.x SDS-enabled systems to 3300 ICP Release 7.x software or later, you will need to migrate the data from the master (local) controller to the slave (remote) controllers.

A Data Migrate operation synchronizes the system data from the master controller to the slave controllers with the data overwrite and merge options set to the recommended defaults. For resilient peer controllers, it also writes the user and device data from the resilient devices on the master controller to the resilient devices on the slave controllers.

You do not need to perform a Start Sharing operation after the upgrade to 3300 ICP Release 7.0 or later software if all the elements were previously sharing data while they were running Release 6.x software.

To perform a data migration

1. Upgrade the controllers to 3300 ICP Release 7.0 software or later.

2. If your network is configured with resiliency, specify the user and device data in the Shared Data Configuration form that you want shared between the resilient controller pairs.

   NOTE: After you upgrade to 3300 ICP Release 7.0 software or later, user and device data is not shared by default.

3. If you are sharing device data between a resilient pair, compare the Single Line IP Sets forms, the Multiline IP Sets forms, and the Wireless IP Sets forms. By comparing these forms, you can determine if a directory number only exists on one of the controller pairs. If there are directory numbers that only appear on one controller and not the other, a synchronization operation will generate a large number of error logs. To prevent these error logs, correct any remote directory number inconsistencies before you perform a synchronization.

4. Go to the Network Elements form of the primary controller.

5. Synchronize the data of the master (local) controller to the slave (remote) controllers. Before you confirm the synchronization operation:

6. Select the Data Migration option in the Confirm Sync to Element(s) window

7. Click the Advanced button

8. Set the Resilient User-Device Policy to "Only Synchronize data where <local element> is the PRIMARY host for resilient devices".

9. Click Apply

10. Click OK

Related Topics

- About_Sharing and Synchronizing Data

- About Synchronizing User and Device Data

- Specifying the Shared Data

- Synchronization Rules

- Synchronizing Data