On Sun, 10 Jul 2022, Nicolas George wrote: > fxkl4...@protonmail.com (12022-07-10): >> I'm just flapping my gums >> As a systems administrator for UNIX systems I wrote more than a few scripts >> Many time I found it necessary to put a sleep between operations >> Several decades ago I was taught to type sync and then type sync again >> before unmounting a drive >> The only reason I ever got was that the second sync was a time delay > > I do not know if it was ever useful at all or if it always was cargo > cult, but I am quite sure it has not been any use on Linux in the last > decade.
But I would not be able to sleep at night I would have nightmares about corrupt data haunting me :) > > You can check for yourself: mount a slow USB stick, create file that is > just large enough to fit in memory with something that you are sure will > not make a (f)sync: > > head -c $[8*1024*1024] /dev/urandom > /media/blah/dummy > > Then unmount and see what happens. > > For extra benefit, start ?grep Dirty /proc/meminfo? in another terminal > before you start and keep an eye on it. > > Regards, > > -- > Nicolas George
