You will get weird results like these if you put two bricks on a single
filesystem. In use case one (presumably replica 2) the data gets written
to both bricks, which means there are two copies on the disk and so twice
the disk space consumed. In the second case there is some overhead
involved
I create a volume，and mounted it, and use df command to view the volume
Available and used .
After some testing， I think the used information displayed by df is the sum of
the capacities of the disks on which the brick is located.
Not the sum of the used of the brick directory.
（I know the
