Setup Raid 1 after the fact

We have a FreePBX setup that has two drives that were not setup with raid when installed. How do i setup raid when it is already installed I found the document at the bottom but it does not seem to work. it is also from 2011.
Any help is greatly appreciated.
https://wiki.freepbx.org/display/PPS/How+to+Setup+Software+Raid+after+the+fact

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