HA Pair 7 mode

Hello,

        We have 2 contrillers namely Ctrl1 and Ctrl2 both are FAS3240 connected to DS4243 and DS224 in HA Pair. 

1) I would like to know which controller is the primary node. ?

2) If ctrl2 is the primary node then how can i let ctrl1 act as a primary node.

when I do a cf giback 

ctrl2 is is giving back and ctrl1 show me takeover mode.

I want ctrl1 to be primary node and in case the problem occurs ctrl2 should take over.

Thanks