Simple primer

echo 60 > /proc/sys/vm/dirtyratio echo 20 > /proc/sys/vm/dirtybackground_ratio

echo deadline > /sys/block/sda/queue/scheduler echo 2048 > /sys/block/sda/queue/nrrequests blockdev --setra 8192 /dev/sda echo 256 > /sys/block/sda/queue/iosched/fifobatch