[mschuster91]

A "flush" command does indeed exist... but disk and controller vendors are like patients in Dr. House [1] - everybody lies. Especially if there are benchmarks to be "optimized". Other people here have written up that better than I ever could [2].

[1] https://house.fandom.com/wiki/Everybody_lies

[2] https://news.ycombinator.com/item?id=30371403