You do this:
Make sure that auto-giveback is enabled
storage failover modify -auto-giveback true -node *
Then perform Takeover/giveback both ways
storage failover takeover -ofnode <node1>
Node 1 will reboot and auto-giveback.
Wait for <node1> to be online for at least 8 minutes. Then go the other way
storage failover takeover -ofnode <node2>
Node 2 will reboot and auto-giveback.
If set up properly, any SAN connection will survive and so will NFS v3 and any CIFS SMB v3.0 continuously-available shares
When using stateful protocols like NFSv4 and any other CIFS, it usually just works and the connection just needs to re-establish.