If you have configured Active- Active failover with DSS V7 and one of your nodes has failed all your resources have been moved to the working one. In order to restore orginal configuration go to:

Click Setup-> Failover-> Function: Resources Pool Manager-> move to local node on the resources that has moved to remote node during failover

If everything is ok your replication should start immediately after failed node is up. Resources will be moved to the correct node after pressing move to local node/move to remote node button.