vRealize Automation uses agents to integrate with external systems. A system administrator can select agents to install to communicate with other virtualization platforms.
vRealize Automation uses the following types of agents to manage external systems:
Hypervisor proxy agents (vSphere, Citrix Xen Servers and Microsoft Hyper-V servers)
External provisioning infrastructure (EPI) integration agents
Virtual Desktop Infrastructure (VDI) agents
Windows Management Instrumentation (WMI) agents
For high-availability, you can install multiple agents for a single endpoint. Install each redundant agent on a separate server, but name and configure them identically. Redundant agents provide some fault tolerance, but do not provide failover. For example, if you install two vSphere agents, one on server A and one on server B, and server A becomes unavailable, the agent installed on server B continues to process work items. However, the server B agent cannot finish processing a work item that the server A agent had already started.
You have the option to install a vSphere agent as part of your minimal installation, but after the installation you can also add other agents, including an additional vSphere agent. In a distributed deployment, you install all your agents after you complete the base distributed installation. The agents you install depend on the resources in your infrastructure.
For information about using vSphere agents, see vSphere Agent Requirements.