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 .ova format. It has a dual core CPU, a 10GB and a 2GB hard disk, and 4GB of RAM. You must deploy the virtual appliance in a vCenter Server environment by using the OVF deployment wizard on an ESXi host.