I have read this question: Can I create a "soft" RAID1 array without nuking data? as well as many other tutorials that layout this general process:
- Create degraded RAID1 array on new drive
- Copy over data to new drive
- Add the old drive to the array, and it gets written over by the data that it holds...
This seems quite inefficient and pointless. Is there a way to do it without copying the data twice?