The latest Dell servers have drivers built for RHEL8 and onward and don’t seem to support CentOS7/SNG7. I know the R350 doesn’t play nice, as other threads have shown.
Has anyone else run into this issue on servers where you would like to configure RAID? An issue I ran into is that the installer can’t see the disks. Not much of a hardware guy, so you may need to dumb down your answer.
I am super not familiar with Dell hardware driver support for Linux but if I was in your shoes I would not rely on the Dell Hardware RAID for this. I would expose the drives directly to the OS and setup software RAID in the OS.