test disk speed with had-arm

test-disk-speed.sh

!/bin/bash

sudo apt-get install hdparm

# get disk names with
sudo lsblk -l

# test speed without cache
sudo hdparm -Tt --direct /dev/sda1
# with cache
sudo hdparm -Tt /dev/sda1

# output
# dev/sda1:
# Timing O_DIRECT cached reads:    62 MB in  2.05 seconds =  30.19 MB/sec
# Timing O_DIRECT disk reads:  94 MB in  3.04 seconds =  30.90 MB/sec