How to add device to existing srdf 

Here is what you do:
- SRDF/A remains active at all times.
- Create an RDF group for the purposes of initial synch up.
- Do the create pair to the synch-up RDF group.
- Synch the device in Adaptive copy mode.
- suspend the device with the -cons_exempt option
- perform a symrdf MOVEPAIR to move the new device into the SRDF/A group
- <set mode async> on the new device (not sure if this step is required from memory)
- symrdf resume the device
- The consistency exempt flag will go away automatically once the device is in srdf/a mode with no invalid tracks (in lock step with all other devices)
- now you can add the device into the device group.