Gluster users - Sep 2017 - wrong DF command output after deleting all files in gluster volume

Dear All,

I just implemented a (6x(4+2)) DISTRIBUTED DISPERSED gluster (v.3.10) volume
based on the following hardware:

- 3 gluster servers (each server with 2 CPU 10 cores, 64GB RAM, 12 hard disk SAS
12Gb/s, 10GbE storage network)

Everything seems to be ok, I created a first subdirectory in my volume
"/volume/test_folder", I populated it with a lot of data. But, after
deleting the subdirectory content, I noticed that the DF command output is not
updated (occupied space seems still here, but it is not true).
So, I tried to remove the empty folder leaving /volume empty. Magically, the DF
output returned the real values.
Is there a way to update the DF command output without have to delete the
subdirectory?
Is there a correct procedure to be followed in this case?

Thank you very much,
Mauro Tridici

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