Volume Replicator 7.4.2 Administrator's Guide - Windows

1

Volume Replicator receives a write on the Primary.

2

Writes it to the Primary Replicator Log.

3

Sends the write to the Secondary hosts and waits for the network acknowledgments from the synchronous Secondary hosts. At the same time, Volume Replicator writes to the data volumes on the Primary.

4

On the Secondary, Volume Replicator receives the write, processes it, and sends a network acknowledgment to the Primary.

5

Sends writes to the data volumes on the Secondary; when the Primary receives a network acknowledgment from all the Secondary hosts, Volume Replicator acknowledges to the application that the write is complete.

The Secondary RVG sends the network acknowledgment as soon as the write is received. This eliminates the time that is required to write to the Secondary data volumes from the application latency. On the Primary, Volume Replicator does not wait for data to be written to the Secondary data volumes. This improves application performance. However, Volume Replicator tracks all such acknowledged writes that have not been written to the data volumes. Volume Replicator can replay these tracked writes if the Secondary crashes before writing to the data volumes on the Secondary or if the Primary crashes before it receives the data acknowledgment.

6

When the write is written to the data volumes on the Secondary, Volume Replicator on the Secondary sends a data acknowledgment to the Primary.