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Linux is capable of setting up software RAID Linear, 0, 1, 4, or 5 arrays via the mdadm command. Doing this requires two or more similar size Linux raid autodetect partitions to be worthwhile (technically you can use the mdadm command on a single partition, but it wouldn't be much of an array then).
=Partitioning Your Drives=
I would recommend using drives that are all the same size and giving them each a single partitionunless you just wish to use the Linear function of mdadm. If you are ready for a more complicated arrangement, you probably don't need this section of the guide anyway.
Run fdisk on the first drive you wish to use in your array (you can type in fdisk -l to get device name and size information if you aren't sure what the drives you wish to use are called). In my case, that looked like this:
