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Preamble

We all know how easy it is to set up software RAID1 during install… but what if you had to do it afterward?  Say for instance you only had one HDD at the time and decided later on you wanted to add a second drive and make it into a Mirror.  Well, this tutorial will show you how to add a second drive of the same size (very important that they be the same size!) and create a RAID on Ubuntu 16 after installation.

For this example, I used Ubuntu 16.04.1 without LVM and without custom partitioning.   And I have already added the second drive to the system.…