In a Distributed Consistency Group (DCG) configuration, the primary RPA and secondary RPAs work together to manage a larger data throughput than a single RPA can handle. This is achieved by dividing the workload among multiple RPAs. As a result, there is an increase in traffic observed on the WAN network between the RPAs.This is because the data that is being replicated needs to be transferred over the WAN to ensure that all RPAs have the necessary information to maintain consistency and data protection1.
The process involves:
* The primary RPA receives write I/Os from the production environment.
* The primary RPA then distributes the data to the secondary RPAs over the WAN.
* The secondary RPAs process the data and replicate it to their respective Journal volumes.
* This distribution of workload allows the DCG to handle higher throughput and IOPS rates than a single RPA could manage1.
It's important to note that while there is additional traffic on the WAN, this does not necessarily mean that the FC (Fibre Channel) links or management network are unaffected.However, the most significant increase in traffic is observed on the WAN network, which is the communication link between the RPAs in a DCG configuration1.