Hi,
Well, I would focus directly on the source of data - why there is TB or GB? Why not only one "size"?
I would recommend to switch from 'df -h' to 'df -k' to get one "size", otherwise you got in such topics as "how to convert one value to be comparable with other one" ...
Other topics the "percentage" - better for comparing or setting the thresholds/limits ...
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