The most common deployment for Site Recovery Manager is to have two sites with one vCenter Server instance per Platform Services Controller.

In this configuration, the Platform Services Controller instances can be either external to vCenter Server or embedded in the vCenter Server instances.

The Platform Services Controller instances can belong to federated or to unfederated vCenter Single Sign-On domains.

Figure 1. Site Recovery Manager in a Two-Site Topology with One vCenter Server Instance per Platform Services Controller
Site Recovery Manager in a two-site topology with one vCenter Server per Platform Services Controller