Assumption of successful synchronization

The export and import phases of synchronization always occur at different times. A sending replica does not require acknowledgment from a sibling replica that a packet has been received and processed successfully. Instead, the sending replica assumes success. This assumption enables an optimization: subsequent updates from a replica do not include the data sent in previous updates.

If a failure does occur (for example, a packet is lost in transit or a CD is unreadable at the sibling replica), you must adjust the epoch numbers at the sending replica to enable the lost data to be sent again. For more information, see Troubleshooting MultiSite operations.