I have a 4 drive R6 right at 49% capacity.. I opted to purchase another 10TB drive, do a fresh DSM7 install on that, copy data over "should be finished today" then I'll pull one drive from existing "degrading but still have 1 drive redundancy" and converting new volume to R1.. after that I'll have redundancy on new array and can just add all drives over and convert back to a new 5 drive R6.... OR I could wing it and attempt an upgrade after I at least have a copy of the data on the new drive.. hmmm decisions