After wasting countless hours I found a solution: You have to download the SAS_RAID_DRIVER_WS2019_S140_5.4.1-0001_A00_ZPE.exe and extract it on a USB Drive, than windows can load the driver inside the extracted folder like with any other raid controller. I already tried that aproache, but without extracting that exe. Also in every Dell Video or documentation they only use the lifecycle controller and never load drivers from a external source (my impression was that the purpose of the controller is to replace exacly that). Somebody should realy rename that file to a .zip (or make it more clear that it is self extracting and has to be done on another machine) and improve the documentation to make it clear that the manuall loading of drivers is still necessary even with the lifecycle controller. It probably worked in CentOS because the required driver is already part of the kernel.  
Hello, i am trying to install Windows Server 2019 Essentials on a Dell T340 using the lifecycle controller. During the wizard I created a Raid 1 using my two Drives and select Server 2019. The lifecycle controller is very picky about the install media. I already tried: 1. The original Microsoft DVD that came with the license 2. Installing the ISO from Microsoft (eval Version) on an USB Stick using RUFUS 3. Mounting the ISO from Microsoft using iDRAC With option 1 and 2 it always complained that the media is not as expected. Only the third option worked without a warning. BUT the result on all three is always the same: The server reboots, the Windows installer is starting but the virtual drive is not available. I also tried downloading the driver ( for the S140) manually from the Dell homepage and copied it to a USB stick, but Windows cant find any drivers (when manual browsing for it). The result is the same with BIOS or UEFI I already updated the Firmware to the newest Version over the Dell FTP.  
T340 Windows Server 2019 Essentials on S140 Raid using the lifecycle controller