Unisphere and Unisphere Central 2020 R1 Administrator's Guide

Change the Transfer Type for a Replication

Use the Edit Replication dialog box to change the transfer type or the replication attributes for a replication or a simulated replication. A replication can be changed from synchronous to asynchronous or asynchronous to synchronous with no service interruption.

1. If a Storage Center is selected from the drop-down list in Unisphere Central, click (Home).
   The Unisphere CentralHome page is displayed.
2. From the DATA MOBILITY menu, click Replications & Live Volumes.
   The Replications & Live Volumes view opens to the Replications tab.
3. Select the replication to change and click (Edit).
4. Edit any of the following settings as needed:
   • Asynchronous: When selected, copies snapshots from the source volume to the destination volume. If Replicate Active Snapshot is enabled, data that is written to the source volume is queued for delivery to the destination volume. If the local Storage Center or site fails before the write is delivered, it is possible that writes will not be delivered to the destination volume.
   • Synchronous: When selected, keeps the source and destination volume fully synchronized at all times by making sure that each write is successfully written to both the source volume and the destination volume before responding to the server.
     • High Availability Mode: Accepts IO requests to the source volume when the destination volume is unavailable (or when latency is too high) to avoid interrupting service. However, if writes are accepted to the source volume, the destination volume data becomes stale.
     • High Consistency Mode: Prevents IO requests to the source volume when the destination volume is unavailable to ensure that the volumes remain identical. However, the source volume cannot be modified during this time, which can interrupt operations.