Hello.  I was trying to increase the storage space of my Server.  I had 4 2 TB data drives.  To do so, I first installed a new 4 TB parity drive, replacing the 2 TB parity drive I had.  The process ran and rebuilt the new parity drive successfully.  After that, I followed the same sequence when installing the replacement data drive, that is, to turn off the array, pull one of the 2 TB data drives I had and insert a new 4 TB data drive.  I assigned it to the same slot as the replaced 2 TB drive and started the rebuild process which ran for several hours.  After it was completed I got an error 'Unmountable: No file system', with a flag to format the new drive.  I did execute the format (looking back now i think this was a mistake).  After the format completed I have a now empty new drive added to the array, with all of the data that was on the removed drive missing.  

 

How can I restore the data to the array?  I have the old drive I removed.  Should I have formatted the drive first?  I did not need to do that when replacing the parity drive?  Thanks...  BTW Im on version 6.7.2

53 minutes ago, Galactus said:

I have the old drive I removed. 

Mount the old drive with the UD plugin and copy to the array.

 

53 minutes ago, Galactus said:

I did execute the format (looking back now i think this was a mistake).

Was able to correct the problem by doing as suggested.  I was able to mount the old data drive, and copy to the new drive with Krusader.  I did temporarily unassign the parity drive during the copy.  Everything is restored and the parity sync is running.  Thanks!