Hello,
For Agentless you need to configure your ILO to be able to be read from the SIM server and to send traps to the SIM server in case of an error. If you need OS information with the agentless option you need one agent, the Agentless Management Service. For older hardware you need either WBEM or SNMP agents. These can be downloaded here : http://h20565.www2.hpe.com/hpsc/swd/public/readIndex?sp4ts.oid=1008829834&lang=en&cc=us
This link is for a DL380 but the software is for all Proliant servers. Since you did not mention your OS i can't be more specific. ESX, Unix/Linux or Windows need specific agents and configuration.
