Return your drives' power on hours via smartctl (requires smartmontools)

spinhours.sh

#!/bin/bash

if [ ! "$(which smartctl)" ] ; then
	echo "smartmontools is not installed"
	exit 1
fi

logical=($(df | grep -Eo 'sd[a-z]'))

# This doesn't preserve the mountpoint of the raid device, but whatevs for now
if [ "$(cat /proc/mdstat | grep -Ec 'md[0-9]')" -gt 0 ] ; then
	logical=(${logical[@]} $(cat /proc/mdstat | grep -Eo 'sd[a-z]'))
fi

if [ "${#logical[@]}" -gt 1 ; then
	logical=($(echo $logical | uniq | sort -u))
fi

for l in "${logical[@]}" ; do
	l="/dev/$l"
	m=$(df | grep "$l" | awk '{print $6}' | head -1)
	spintime=$(sudo smartctl -A $l | grep -i power_on_hours | awk '{print $10}' | tr -d "\n")
	if [ $spintime ] ; then
		if [ $spintime -gt 8760 ] ; then
			spinyears=$(($spintime / 24 / 365))
			spintimer="${spinyears}y $((($spintime - ($spinyears * 365 * 24)) / 24))d"
			timeformat=''
		elif [ $spintime -gt 24 ] ; then
			spintimer=$(($spintime / 24))
			timeformat='d'
		else
			timeformat='h'
		fi

		echo -e "Logical:\t${l}"
		echo -e "Mountpoint:\t${m}"
		echo -e "Raw:\t\t${spintime}"
		echo -e "Readable:\t${spintimer}${timeformat}\n"
	fi
done