RAID is called mirror: You need 2 drives: The original and the mirror.

You can make a RAID1 array of 2 disks + 1 spare if you wish.

On Sun, Mar 14, 2010 at 12:06 AM, Carlos Mennens [off-list ref] wrote:

I was told by my distributions Wiki page that Grub doesn't support
RAID 5 or RAID 6 so I would need to create a volume with three disks
and set the level to RAID 1:

# mdadm --create /dev/md1 --level=1 --raid-devices=3 /dev/sda1
/dev/sdb1 /dev/sdc1 --spare-devices=1 /dev/sdd1

Is this possible to mirror three identical drive partitions? I was
talking to some co-workers and was told that I could only pair two
drives on RAID 1.

Can anyone please help me understand this?
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       Majed B.
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