Hi Maurizio,
The two lines below are normal:
actionagent riskprd1 DOWN
actionagent riskprd6 DOWN
The action agent will only be UP on the Central Management Server (CMS).
If you would like to remove the nodes totally you should log onto the boxes and run the folowing:
/opt/VRTSmh/bin/migrate standalone_mode -d <central_management_server.domain.com>
You will be prompted for the vea_agent password from the CMS.
Please let me know if you have any further questions.
Regards,
Frank.