Solutions
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Philippe Bourdon's post in Cache is always at 100% was marked as the answerSo you are correct... I had to do some digging because I knew that my current environment only utilized 1.2TB.
It turns out, I had a number of local volumes that were no longer being used - and filled up almost 700Gb of my docker.image file.
I ran 'docker volume ls' and the dug into each of them to make sure I could remove them. After I removed them, my docker.image.file shrunk to 1.2TB.
Tnanks for the help.