Ravi,
Bios configures SCSI and could build RAID 1 using the system utility.
I think you might need to configure the Hardware Raid within the RAID Card bios, this utility is kinda complicated, I had faced similar problem with Dell RAID Controller to achieve RAID 1, You might need to have your manual Hardware RAID Handy to utilize this BIOS Utility.
Usually these BIOS RAID 1 settings are configured by default. i.e. factory setting.
Thanks & Regards, Mitul Limbani, Founder & CEO, Enterux Solutions, The Enterprise Linux Company (TM), www.enterux.com