Cloud fomration shadow volume clarification


we are using cloud formation script to launch aero spike cluster replication factor is 2 . we attached EBS vloume also to it . whenever node goes down auto scaling feature launching node. now we lost EBS vloume …

can we launch new node by attaching EBS volume of node which went down ?? if not so what will be the use of EBS ?? in what cases we should use ?? what problems may occur if we don’t have shadow device ? note we given replication factor 2 re balance happens