CA Performance Management discovers ESX hosts and virtual machines in the following ways:
- Through ICMP
- Through SNMP, if the servers have an SNMP agent deployed
- Through discovery of a server running systemEdge with the VCAIM
You can discover the VMs and ESX Hosts directly with SNMP. If you need to collect vCenter data you will need to install the vCenter Server Application Insight Module (VCAIM).