I have a usage question: in testing the write speed of a raw disk drive, I saw “randwrite” achieve bandwidth identical to “write” even with small block sizes, at least until I added `--direct=1` option (`--fsync_on_close=1` did not make any difference). Does that mean that this option is pretty much required for testing raw disks? (Specific command line I used: "fio --filename=/dev/sdb --name=rawdisk --rw=randwrite --bs=4k --size=256g --runtime=60 --direct=1”.) For realistic testing of writes to a *filesystem* where our applications won’t go beyond regular POSIX open/write/close API, I assume I don’t need to set the `direct` parameter? Thank you, Davor
