Не тупим
tune2fs -o journal_data_writeback /dev/disk/by-uuid/2f80a8fa-19e1-4cd6-8d35-54ce47455f2c echo "noop" > /sys/block/sda/queue/scheduler http://unix.stackexchange.com/questions/30286/can-i-configure-my-linux-system-for-more-aggressive-file-system-caching