Hello Arnd,
flashbench -s --scatter-span=3 --scatter-order=14 --blocksize=8192 --count=100 /dev/sdb -o output.plot
I did that, but the output.plot file is empty :(
I tried to reproduce it here, and accidentally pasted the '>' from the email into the command line, which resulted in bash overwriting the flashbench command with an empty shell script. Maybe you did the same? Deleting and rebuilding flashbench fixed it here.
No, here flashbench runs and creates output.plot if it does not exist before, but does not write anything into it.
I'll look into the sources to see what happens.
Philippe