VA-IT,   I would start with updating the OS Driver pack, found here. After that then boot to the Lifecycle Controller and proceed with OS Deploy from there.  Also, would you verify if you have already configured a raid Virtual Disk? If not then I would do that, and then proceed from there.   Let me know what you see.      
Hello, I'm trying to install Windows 2019 server on a PE R740 server, with a RAID on a PERC H750. I'm using the virtual media feature on the iDRAC to mount the drivers, so that I should be able to see the disks, following this procedure: How to install the operating system on a Dell PowerEdge Server? (OS deployment)  Unfortunately, I'm facing this issue:  [IMAGE] Does anybody know why, and more important, how to fix this ? Thank you
Install Windows 2019 on PE R740 with mounted drivers for RAID fails