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 c_troubleshoot_ccms_ops.html#sii-trouble-94959.