Finally
I can do that, although a lot of these writes are actually "random".
What I can do is to enable part of th benchmark and have a fixed 1-2TB file where random writes takes place at some interval.
Those writes would never be handled by TRIM as TRIM can only do cleansing when a file is "deleted".
edit:
The TRIM hang is more like One_Hertz's except for that it building up speed for a short while and within a few minutes it slowly drops to about 32-33MB/s. (it peaks at ~39MB/s)





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