storage
(Required for Multi-AZ DB clusters) (Forces new for Multi-AZ DB clusters) Specifies the storage type to be associated with the DB cluster. For Aurora DB clusters, storage_type modifications can be done in-place. For Multi-AZ DB Clusters, the iops argument must also be set. Valid values are: "", aurora-iopt1 (Aurora DB Clusters); io1 (Multi-AZ DB Clusters). Default: "" (Aurora DB Clusters); io1 (Multi-AZ DB Clusters).