Create mirror without data loss

[Guille6219]

First thread here, though I've been reading for quite some time now. I recently configured my FreeNAS box and all the plugins etc, but since I didn't know what I was really getting into, I started with some hard drives I had lying around (don't worry, all other hardware parts are FreeNAS "friendly", I do have ECC RAM and all that stuff). I am now aiming for redundancy, but money is hard to get, and for now I bought a single 4TB WD Red for storage. I will be buying another one of these in a month or so, but I need to store my data in the box as soon as possible. The question is, when I buy the next drive, will I be able to create a mirror with it of the one I already have installed without loosing any data?
Guille

 

[danb35]

Yes, but it's tricky, as you can't do it through the GUI. The appropriate CLI steps appear to be documented in this thread, though I can't vouch for them personally.

 

[Bidule0hm]

Yes ;)

Edit: ah, @danb35 beat me :)

 

[Guille6219]

Will give it a read, thanks for the fast support!