The environment in which you run the vSphere Replication virtual appliance must meet certain hardware requirements.
vSphere Replication is distributed as a 64-bit virtual appliance packaged in the .ovf format. It is configured to use a dual-core or quad-core CPU, a 16 GB and a 17 GB hard disk, and 8 GB of RAM. Additional vSphere Replication servers require 1 GB of RAM.
You must deploy the virtual appliance in a vCenter Server environment by using the OVF deployment wizard on an ESXi host.
vSphere Replication consumes negligible CPU and memory on the source host ESXi and on the guest OS of the replicated virtual machine.
The operation of vSphere Replication depends on certain services, ports, and external interfaces. For more information, see Services, Ports, and External Interfaces That the vSphere Replication Virtual Appliance Uses.