6.2 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 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-ROM is unreadable at the sibling replica's site), the sending site must adjust its records to enable the lost data to be resent. For more on this topic, see Chapter 10, Troubleshooting MultiSite Operations.