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Now that I have a real keyboard
Typically software RAID has issues with install/config when it is used on the boot drive and/or / partition. You can make a small (few gigabytes) partition at the front of one drive as /boot, use the same space on the other for your swap partition. It is still hard to deal with during install, but Debian has an option for LVM/RAID during install - Mint just hides it since it is more focused on the desktop.
What I do is have a single 120gb SATA drive to boot from and use as / (it is /dev/sda w/ a root partition and a swap partition), and then 2 500gb SATA drives set up after boot as software RAID-1 and mount it as /home so all of my user files are RAID protected. Since I do a lot of web programming I also set up Apache to use /home/apache as its DocumentRoot so all of my PHP and such are on RAID as well.
Any of the tutorials for Debian, Ubuntu, or Mint for setting up mdadm after install will work for you. It is basically one command, set up a default config file, modify /etc/fstab, and let the drives synch. Note that you can copy data to it while the drives are synching.
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“IN MY EXPERIENCE, SUSAN, WITHIN THEIR HEADS TOO MANY HUMANS SPEND A LOT OF TIME IN THE MIDDLE OF WARS THAT HAPPENED CENTURIES AGO.”
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