The BIOS can set the disks up as RAID0, RAID1 or RAID0+1 or as individual disks. How can I tell the sata_promise I am using RAID mode not individual disks?
You can use normal Linux software RAID (CONFIG_BLK_DEV_MD in kernel configuration). It works on any controller. You have to set it up using standard Linux tools.
See http://www.tldp.org/HOWTO/Software-RAID-HOWTO.html Michal