Action C:

A PPRC path exists from the primary to the secondary, but not in the reverse direction. The primary and secondary volumes have the same physical capacity. In this situation, your "switch pair, and swap" choice directs P/DAS to issue the following additional message to the system operator:
  IGF521A NO PATH IN OPPOSITE DIRECTION: REPLY 1 TO CONTINUE SWAP │
     2 TRY AGAIN │ 3 TERMINATE SWAP

Select one of the message options, as described in Table 1.