Dell PowerFlex 4.6.x Technical Overview

Replication I/O flow

For replicated volumes, application data is processed by SDRs at the source and passed to the SDRs at the target.

Application I/Os (both reads and writes) intended for replication volumes are sent from an SDC to an SDR. The source SDR packages the data and distills it so that only the most recent writes are included. The source SDR sends the data over the WAN to the target SDR. At the target system, the SDR processes the replicated data and applies it to the volumes.