So that my harddisk does not get noisy every 5 seconds

$ cat bin/disk-low-write-mode.sh
#!/bin/sh

# age time, in seconds
MAX_AGE=600
# allowed dirty ratio, in pct
DIRTY_RATIO=40

# kernel default dirty buffer age
DEF_AGE=30
DEF_UPDATE=5
DEF_DIRTY_BACKGROUND_RATIO=10
DEF_DIRTY_RATIO=40

REMOUNT_PART="/ /home /pub"

case "$1" in
        start)
                AGE=$((100*$MAX_AGE))
                echo "$AGE" > /proc/sys/vm/dirty_expire_centisecs
                echo "$AGE" > /proc/sys/vm/dirty_writeback_centisecs
                echo "$DIRTY_RATIO" > /proc/sys/vm/dirty_ratio
                echo "$DIRTY_RATIO" >
        /proc/sys/vm/dirty_background_ratio
                for part in $REMOUNT_PART; do
                    mount $part -o remount,relatime,commit=$MAX_AGE
                done
                ;;
        stop)
                U_AGE=$((100*$DEF_UPDATE))
                B_AGE=$((100*$DEF_AGE))
                echo "$B_AGE" > /proc/sys/vm/dirty_writeback_centisecs
                echo "$U_AGE" > /proc/sys/vm/dirty_expire_centisecs
                echo "$DEF_DIRTY_RATIO" > /proc/sys/vm/dirty_ratio
                echo "$DEF_DIRTY_BACKGROUND_RATIO" >
        /proc/sys/vm/dirty_backgrou
        nd_ratio
                for part in $REMOUNT_PART; do
                    mount $part -o remount,commit=$DEF_UPDATE
                done
                ;;
        *)
                echo "$0 {start|stop}"
                ;;
esac

exit 0