max_files=$(( num_vols - redundancy ))
for (( num_files=MIN_FILES; num_files <= max_files; num_files++ ));do
make_test_vols "$num_vols"
max_files=$(( num_vols - redundancy ))
for (( num_files=MIN_FILES; num_files <= max_files; num_files++ ));do
make_test_vols "$num_vols"