simple read-write disk benchmarks.sh

# on debian-based linux
# run as root so drop_caches works
for i in /home/jamie /mnt/duo /mnt/data3; do 
  echo $i
  echo "writes: "
  dd if=/dev/zero of=$i/tempfile bs=1M count=1024 conv=fdatasync,notrunc status=progress 2>&1 | grep copied
  echo "dropping caches..."
  echo 3 > /proc/sys/vm/drop_caches
  echo "reads: "
  dd if=$i/tempfile of=/dev/null bs=1M count=1024 status=progress 2>&1 | grep copied; 
  
  echo "buffered reads: "
  dd if=$i/tempfile of=/dev/null bs=1M count=1024 status=progress 2>&1 | grep copied
  
  echo
done