US Patent 9235632 Synchronization of replication

A computer implemented method, computer program product, and system for data replication comprising directing Input/Outputs (I/Os) intercepted by a splitter to a synchronizer, directing initialization data to the synchronizer from an initialization process, determining, at the synchronizer, whether the data arrived from the initialization process has been overwritten by the splitter, based on a determination that the data has been overwritten, discarding the data and based on a determination that the data has not been overwritten, sending the data to a Logical Unit.