Change the mode of replication
You can edit volume pair properties to change the replication mode of the volume pair relationship.
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Select Data Protection > Volume Pairs.
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Click the Actions icon for the volume pair.
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Click Edit.
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In the Edit Volume Pair pane, select a new replication mode:
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Real-time (Asynchronous): Writes are acknowledged to the client after they are committed on the source cluster.
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Real-time (Synchronous): Writes are acknowledged to the client after they are committed on both the source and target clusters.
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Snapshots Only: Only snapshots created on the source cluster are replicated. Active writes from the source volume are not replicated. Attention: Changing the mode of replication changes the mode immediately. Be sure that you have coordinated these changes at both sites.
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Click Save Changes.