Hi everyone, been using UnRaid happily for three years, but this is my first post. We just moved this week, and in the throes of doing the million tiny things that are associated with that I fear I may have screwed up badly. We re-upped with U-Verse and, though the NAS had cooperated in the past, it was having trouble with this installation -- I simply couldn't see the array. Well one thing led to another, and wound up clean installing 4.7 (I was on 4.6.something). Which obviously, you guessed it, wiped my drive assignments and shares. The shares I'm not so worried about, but the drive assignments...well, I didn't exactly have them memorized, and there are several that are the same model drive. The only one I'm positive about is the cache drive, since it's the only one of its size.

 

So I'm hoping beyond hope that someone knows of a way or utility to (at the very least) see which one is marked as the cache drive. I don't want to press the "start" button for fear that, should I have the drives assigned incorrectly, I will lose all 7+ TB of data on my 12-disk array. Any help would obviously be appreciated.

 

EDIT: and yes, I know I should have taken a screenshot. I really wish I had done so. No further shaming is necessary. 

I don't think it's as bad as you think it is, assuming you didn't panic and start pushing buttons.  If you know for sure the data on the drives is okay, then the wiki is your friend. 

 

Start here.

 

If that makes sense, read this next.

The only critical drive to know about is the parity drive.  If you put the wrong drive in he parity slot it is liable to get clobbered.

 

What I would do is assign each one of your disks to a disk slot (leave the parity slot unassigned).  When you start the "array", all of the drives except one shoult mount, and the one that does not mount will be your parity drive.  (Of course you should do your due diligence and make sure you can access all of your data drives).  You can then stop the array, assign your parity drive to the parity slot, and either rebuild parity or use the "trust" procedure that aiden linked in the prior post.

 

Take your time.  Ask questions if something unexpected happens.  I do not think you will lose any data.

The order of the drives does not matter except for the parity drive (see below). Do you know which is the parity drive? You can assign drives and try to start the array. Just do not format any drive. None of your drives should require formatting. If the parity drive is assigned as a data drive unRAID will indicate that the drive needs formatting. If any drive is indicated as needing formatting then it is the parity drive.

 

(Below)

You will need to reconfigure your user shares based on the new drive order. If you have any client machines mounting disk shares then you will need to reconfigure those as well. Or, once the array is up, you can stop the array and rearrange the data drives as needed.

 

If more than one drive is indicated as needing formatting then report back this problem.

 

Assuming that you get the parity drive selected as parity, unRAID will want to rebuild parity. You can use the "trust my parity" procedure indicated by aiden to avoid parity rebuild.