"No space left on device" but df shows 1.22 TB available!

[scotty03921]

Correction (I hit Esc in the browser window because I’d been using bash and vi so much while writing this that my fingers forgot I shouldn’t do so in the Submission window:-) :

but total available space is << 6TB at 3.96 GB.

and the request:

Please advise the best/easiest way to clear files that have already entered the Recycle Bin, without needing to set up AD.