Using Dual Copy to Migrate Volumes

The following steps show how to migrate data from one device to another without disrupting the application. Separate procedures are provided for simplex volumes and duplex pair volumes.

Note:

When you use dual copy to migrate volumes, remember that the correspondence between the original CCA and DDC addresses is switched and that the Storage Control retains the updated CCA-to-DDC address correspondence.
Use the message response to the DEVSERV PATHS command to identify the current CCA-to-DDC relationship.
When you use dual copy to migrate from 3390 devices to RAMAC devices, an invalid format 4 DSCB is created on the target device. Use ICKDSF to fix the format 4 DSCB. See your IBM® representative for the latest service level of ICKDSF that provides this function.