Example of decreased efficiency

This example demonstrates circumstances under which running chepoch –actual can decrease efficiency in your synchronization operations.

In this example, two replicas in a VOB family, sanfran_hub and sydney, exchange update packets every 15 minutes. At some point during the day, packets may start accumulating at one of the replicas because the imports are taking a long time. For example, there is a lot of development activity in the sydney VOB, and four packets are waiting to be imported.

In this case, if you run chepoch –actual at sanfran_hub before generating a packet for sydney, the update packet will contain all the operations that are already in the packets waiting to be imported at sydney. You can use the chepoch –actual –raise_only command to avoid sending operations multiple times. With –raise_only, chepoch does not lower epoch numbers for sibling replicas.