How do I use the Dell PowerEdge S100 and S300 Software RAID controllers with Linux operating systems?
You cannot use the Dell PowerEdge S100 and S300 PERC RAID controllers under Linux. These devices only works with MS-Windows operating system as they are software only RAID (fake RAID device).
You need to disable RAID storage - the S100/S300 controllers by visiting BIOS settings.
You can now use standard software RAID provided by Linux. See how to set RAID1 using two disks under Linux.
Another option is add-on hardware RAID card to the server such as PERC 6/E SAS controller with RAID or SAS 6I/R SAS controller with RAID.