first raid

Hi all. I would like to add RAID functionality to my system, mirroring
style.

I am totally new to RAID, so forgive my simple question.

My system is a running debian etch on an SATA dirve as sda, hda & hdb non
existing. Would like to add an sdb, and have sda mirrired on it through
RAID. Motherboard 'ultra' nForce nvidia chipset. Can I just add this
drive, make some changes in BIOS, and be done???/ Or are there some
changes OS wise. TYIA
--
dw
.

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