We are looking into this to have the API functions for the Failover, it might be in the next release for the DSS V7 but I am not 100% sure due to testing and the many other feature requests that are currently in the que but we will have it for sure. The one way to mitigate the issue is to make sure to drop down the Secondary 1st then after the Primary then when bring the systems up bring up the Secondary 1st then the Primary.