DD test for Spinning and SSD disk

dd_disk_test.sh

## Change these variables for your environment
SPINNING_DISK_OUTPUT_FILE_PATH=
SSD_DISK_OUTPUT_FILE_PATH=
COUNT=262000
BLOCK_SIZE=4k
##############
TEMP_FILE=/dev/zero

> /tmp/dd_output ;

for i in 1 2 3 4 ; do
	> /tmp/bench_out_$i;
done

if [ -n "$SPINNING_DISK_OUTPUT_FILE_PATH" ]
then
for i in 1 2 3 4 ; do
	echo 3 > /proc/sys/vm/drop_caches ;
	dd if=$TEMP_FILE of=$SPINNING_DISK_OUTPUT_FILE_PATH bs=$BLOCK_SIZE count=$COUNT oflag=direct,dsync 2>> /tmp/bench_out_1 ;
done
fi

if [ -n "$SSD_DISK_OUTPUT_FILE_PATH" ]
then
for i in 1 2 3 4 ; do
	echo 3 > /proc/sys/vm/drop_caches ;
	dd if=$TEMP_FILE of=$SSD_DISK_OUTPUT_FILE_PATH bs=$BLOCK_SIZE count=$COUNT oflag=direct,dsync 2>> /tmp/bench_out_2 ;
done
fi

if [ -n "$SPINNING_DISK_OUTPUT_FILE_PATH" ]
then
for i in 1 2 3 4 ; do
	dd if=$TEMP_FILE of=$SPINNING_DISK_OUTPUT_FILE_PATH bs=$BLOCK_SIZE count=$COUNT 2>> /tmp/bench_out_3 ;
done
fi

if [ -n "$SSD_DISK_OUTPUT_FILE_PATH" ]
then
for i in 1 2 3 4 ; do
	dd if=$TEMP_FILE of=$SSD_DISK_OUTPUT_FILE_PATH bs=$BLOCK_SIZE count=$COUNT 2>> /tmp/bench_out_4 ;
done
fi

if  [ -z "$SPINNING_DISK_OUTPUT_FILE_PATH" ] && [ -z "$SSD_DISK_OUTPUT_FILE_PATH" ]
then
echo "DISK_OUTPUT_FILE_PATH has not been set in this script "
exit 1
fi

echo "dd output for Spinning Disk with kernel cache dropped and direct + synchronous write" >> /tmp/dd_output
grep -i copied /tmp/bench_out_1 | cut -d ' ' -f 8-9 >> /tmp/dd_output
echo " " >> /tmp/dd_output

echo "dd output for Spinning Disk with kernel cache default (ON) , dd cached writes" >> /tmp/dd_output
grep -i copied /tmp/bench_out_3 | cut -d ' ' -f 8-9 >> /tmp/dd_output
echo " " >> /tmp/dd_output

echo "dd output for SSD Disk with kernel cache dropped and direct + synchronous write" >> /tmp/dd_output
grep -i copied /tmp/bench_out_2 | cut -d ' ' -f 8-9 >> /tmp/dd_output
echo " " >> /tmp/dd_output

echo "dd output for SSD Disk with kernel cache default (ON), dd cached writes" >> /tmp/dd_output
grep -i copied /tmp/bench_out_4 | cut -d ' ' -f 8-9 >> /tmp/dd_output
echo " " >> /tmp/dd_output

cat /tmp/dd_output

#rm -f $TEMP_FILE
#rm -f $SPINNING_DISK_OUTPUT_FILE_PATH;
#rm -f $SSD_DISK_OUTPUT_FILE_PATH;