infinite loop dd benchmark stress test script

X=1
while :
do
echo $X
echo "write sync"
time sh -c "dd if=/dev/zero of=/mnt/sda/ddfile bs=8k count=4000000 && sync"
echo "write flush"
time sh -c "dd if=/dev/zero of=/mnt/sda/ddfile bs=8k count=2000000"
echo "read"
time sh -c "dd if=/mnt/sda/ddfile of=/dev/null bs=8k"
((X+=1))
done

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