DDR provides the following functions:

	Replicate data in various modes Synchronous and background-copy (asynchronous, deltas only) modes supported. Change the replication mode non-disruptively.
	Multiple replicas Create multiple replicas of the same original simultaneously
	Disconnect replicas from original volumes Disconnect volumes at any time to pause synchronization, enabling access to the replica.
	Re-synchronize volumes Reconnecting volumes after separation will re-synchronize the replica to the original volume by only copying the differences.
	Access the original volume when restoring from a remote volume Allow files to be accessed even while restoring from a replica. You can decide whether or not to update the replica with the new/changed data
	Return to normal operations faster After failover to a replica (e.g. in a DR scenario), only the updated data needs to be sent to the original volume to restore normal operation, rather than restoring the entire replica volume.
	Access replica before replication complete Read data from a replica before the replication has completed - data is sent from the original on-demand