On 10.03.2015 01:23, Sam Varshavchik wrote:
...
> For starters, in your case taking an existing partition and turning it into  
> a RAID volume is going to be a big project. You'll have to back up your  
> existing data somewhere, erase the existing partition, create a raid  
> partition, then restore your data from backups. I'm not aware of a way to  
> turn an existing non-RAID partition into a RAID one.
> 

:)

man 8 mdadm

CREATE MODE
...
To  create  a "degraded" array in which some devices are missing, 
simply give the word "missing" in place of a device name.
This will cause mdadm to leave the corresponding slot in the array empty.
... For a RAID1 array, only one real device needs to be given.
All of the others can be "missing".

"missing" == existing non RAID drive

In brief:
1. Create a "degraded" array with 2nd drive
2. Transfer the contents of the "missing" drive to it
3. Prepare "missing" and add it to the array i.e. RAID-1


Ref.
There are plenty howtos out there.


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