How to enable SATA RAID on DL180G5 E5405, because i did not find any equivalent option on the BIOS, nor any prompt for that.
Although some very sophisticated disk controllers can easily be added to a DL180 G5 the basic server only comes with a fairly rudimentary south-bridge-based controller.
That said it can support RAID 0 or 1 via pressing F10 during POST.
From there the option you're looking for is under Advanced, then Disk Configuration.
Be aware that this controller only supports 4 disks, you'll need another controller for five or more disks. Let me know if you have a different controller as I'll be able to help with that if required too.