Precision 3450 - PXE installation in RAID1 'partitioning issues'

Question

Hello, maybe this isn't fully DELL related, but I'm having trouble with installing Suse 15 SP3 over PXE on RAID1. I have Precision 3450 with 2x NVME M2 SSD in RAID1 configured via Intel Rapid Storage Technology. When I start installation, PXE boot is proceeding until part 'create partition plans'. I was using the same source installing device on Precision 3930 where I had also 2x SSD (but not M2 NVME) in RAID1 also via Intel Rapid Storage Technology and there wasn't any problem. I have installed over 70 devices, so the problem won't be likely in the source 'installation server'.. With same procedure and means I can't install operating system on Precision 3450. Also when I use just 1X NVME disk in Precision 3450 it works without any problems.. There must be problem with RAID, but I can't figure out what it can be.. There aren't many options to choose from though, so I can't do really much. But I highly suspect, there will be problem with hardware.   This is my procedure and configuration of BIOS: (BIOS version is 1.6.1) Load Defaults > Factory Defaults Storage - Sata Operation = RAID On Display - Primary Display = NVIDIA HD Graphics Connection - Enable UEFI Network Stack = ON Power - Block Sleep = ON Security - Data Wipe on Next Boot > ON  then creating RAID via F12 - Device Management - Intel Rapid Storage Technology, choosing RAID1 and selecting my two NVME disks. They are physically placed in slot 2 and slot 3 on motherboard, because slot 1 can't be detected via this Intel Rapid Storage Technology, so I had to move it from slot 1 to slot 3. And this is the error:

Strezz · Answer

UPDATE:I have tried installing there Linux SLED 15sp4 via flash drive manually. I also tried Windows 10 via flash drive. Both had the same problem - the installer couldn't see any drives, where system could had been installed.So there must be problem with DELL itself - RAID1 with 2x NVME doesn't simply works, or I have some bad settings. When I switch from RAID mode to AHCI mode, I can use both drives separately, it works.. only not working in RAID..

Chino de Oro · Answer

After created RAID 1, have you try to set the RAID volume as boot drive in BIOS prior to operating system installation.

Strezz · Answer

I can't see anything such as RAID volume or something with name of the disks in my boot menu. I also don't know how I could add manually such option. Although there is a button to "add", there are no further options..
I took some photos - there are my boot menu options, also there is clearly visible the presence of "RAID on" option in BIOS and "Intel Rapid Storage Technology" RAID1 (DELL claimed via private messages, there is no RAID at all - so I attached even these photos is an evidence, it IS there.. LOL)

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