I got a Lenovo thinkstation with a HP P400 smart array controller.
I have made a raid 5 set of 3 harddisks with the F8 menu of the controller.
After that I could install ESX 6.5 fine, it does see the P400 controller but its loaded with a cciss driver.
I would like to change it for a hpsa-scsi driver and be able to load the software from hp to monitor this raid card from vmware.
On the internet I saw several posts that people did manage to get it working on esx 5.5 and esx 6.0
If anyone here could help that would be nice.