Linux RAID on Gutsy

[Oscar Veloz]

I have Gutsy server installed on a machine I built with 2 identical hard
drives, but during install of the OS I only used one, the other is
blank.  I have noticed in webmin the ability to manage RAID and I am
wondering if I can run some sort of software RAID 1 to mirror from one
drive to another?  I already tried doing apt-get install mdstat but apt
found nothing.