What exactly Non DFS Used means?

Question

This is what I saw on Web UI recently

 Configured Capacity     :   232.5 GB
 DFS Used    :   112.44 GB
 Non DFS Used    :   119.46 GB
 DFS Remaining   :   61         


        

Answer 1

One more thing.
Non DFS used = 100GB(Total) - 30 GB( Reserved) - 10 GB (DFS used) - 50GB(Remaining) = 10 GB
Because ext3/ext4 default reserve 5% (refer to reserved block count ), so it should be
Non DFS used = 100GB(Total) - 30 GB( Reserved from App) - 5 GB(Reserved from FS) - 10 GB (DFS used) - 50GB(Remaining) = 5 GB

From sudo tune2fs -l /dev/sdm1 get the "Reserved block count"
BTW, tune2fs -m 0.2 /dev/sdm1 to tune the reserved space.