Setting up RAID for a drive with user folders on it!

We have one hard drive for user data, partitioned into 2 volumes, IDHome and IDData. IDHome contains the home directory for all the users. IDData is shared network data. I want to set up a Raid 1 array for this entire drive, however it seems that you cant do this on the fly without erasing both drives. Ive got a second identical drive, but when I try to create the array in Disk Utility, it wants to erase both drives. That would be a catastrophy of monumental proportions!
Everything from the original drive is backed up, so Im not affraid of losing anything. But I dont even want to go there.
Hers my main qustion. If no users are connected to the server and I backup the original HD, set up the Raid array (thus erasing both drives), then copy everything back onto the array, are users going to be able to log in as if nothing happened? Is OS X going to care that /Volumes/IDHome is no longer on /dev/disk1 and instead on the Raid array now (/dev/disk2 I guess)? Is OS X looking for specific hard drives or just at /Volumes/IDHome?
Ive read a couple of articles on the internet about using the command line diskutils to first enable one drive as a raid array, making the computer think the array exists, then adding a second drive to the array and "rebuilding" the array... but I go back to my original question, is osx going to care that /volumes/idhome isnt technically on /dev/disk1.
I tried to test diskutil enableRaid mirror /dev/disk2 (/dev/disk2 is a backup drive we have installed on the server), but I got an error message saying the syntax needed to be in diskutil enableRaid mirror /Volumes/VolumeName format...it wanted /Volumes in stead of /dev is guess.

You can't partition an Apple software raid drive.

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