With SVM Disaster Recovery I have 2 questions:
1) Is synchronous snapmirror supported?
2) Can you failover a single volume from the SVM or it is only meant in SVM level recovery?
SM sync do not exists in Cmode. you can use MetroCluster (now also over IP) for sync replication
you can only manage the SM relationship as part of the SVM DR. but i think you can do a vol clone or remove the volume from the SVMDR to mount it on another SVM.