Dell EMC PowerVault MD 34XX/38XX Series Storage Arrays Administrator's Guide

A replicated pair consists of two virtual disks, one serving as the primary virtual disk on the local storage array and the other serving as the secondary virtual disk on the remote storage array. In a successful Remote Replication configuration, both these virtual disks contain identical copies of the same data. The replicated pair is contained in Remote Replication group, allowing them to synchronize at the same time as any other replicated pairs within the same Remote Replication group.

At the I/O level, all write operations are performed first to the primary virtual disk and then to the secondary virtual disk.