The best way to purge McAfee DLP/HDLP events, For McAfee DLP and HDLP Version 9.3,9.4
On ePO console go to Menu-> Data Protection -> DLP Incident Manager
On ePO console go to Menu-> Data Protection -> DLP Incident Manager
Go to Incident Tasks
Click Actions
Choose a Name and write a description if you want
Choose the Filter you want, I prefer always to choose the Occurred(UTC) - Is not within the Last X Days.
Click OK to save.
Make sure the state is Enable
Go to Menu -> Automation -> Server Tasks
Click on Actions -> New Task
Choose a Name and write a description if you want, Click Enable and then Next
Click on the drop down list next to the Actions, Choose DLP Incident tasks runner
Mark the task you created, click ok.
Make sure that the task is want you need(with the filter you configure)
Click Next
Configure the schedule to run the task.
If you configure to run the task in my example - Every day at 11:00 PM, The task will purge all the events older then 90 days.
Click Next and save.
See the task you created.
You can also run this task manually by click on the run button
The first time the task will run maybe it will be at the beginning on status waiting, at Server Task Log screen.
Be patient!!!
you can also click on the log(while it on waiting) and you will see it started and working.
Good Luck!!!