[Script to spindown unassigned USB HDDs]

On 5/22/2020 at 4:43 PM, CS01-HS said:

I have a USB HDD in unassigned devices which I use for backups. The drive won't spin down for whatever reason, mounted or not.

 

My solution was a modified version of this script that I have User Scripts run every hour.

It takes a list of drives, checks for activity and spins them down if they're inactive and spun up.

 

I thought I'd share it.

 

NOTE: The green "led" in Unassigned Devices stays green even when the drive's spun down, I don't know how or if it detects power status.

#!/bin/bash
# This script looks for recent disk access, and if nothing has changed, puts /dev/disk/by-id/${drive} into spindown mode.
#
# Set your drive identifiers (listed in /dev/disk/by-id/) ignoring characters after the last "-"
# e.g. listing: usb-WD_My_Passport_25E2_75831314363630505A37-0:0
#   becomes: usb-WD_My_Passport_25E2_75831314363630505A37
drives=(
  "<DRIVE_IDENTIFIER_1>"
  "<DRIVE_IDENTIFIER_2>"
)

# spindown delay in minutes
SPINDOWN_DELAY=30

# Uncomment to enable debug mode
#DEBUG=true

# Set the directory where the status files will be stored,
# /tmp/ is a fine default
STATUS_DIR="/tmp"

current=`date`

# create status_dir if it doesn't exist
mkdir -p ${STATUS_DIR}

do_device() {
    local device_id=$1
    device=`ls -l /dev/disk/by-id/ | grep ${device_id} | head -1 | tail -c4`
    filename="${STATUS_DIR}/diskaccess-${device_id}.status"

    is_awake=`smartctl --nocheck standby -i /dev/${device} | grep 'Power mode is' | egrep -c 'ACTIVE|IDLE'`
    if [ "${is_awake}" == "1" ]; then
        if [ "$DEBUG" = true ]; then
            echo "${device} is awake"
        fi

        stat_new=$(grep "${device}1 " /proc/diskstats | tr -dc "[:digit:]")

        if [ ! -f "${filename}" ]; then
            echo ${current} "- ${filename} file does not exist; creating it now."
            echo ${stat_new} > ${filename}
        else
            stat_old=`cat ${filename} | tr -dc "[:digit:]"`

            # calculate minutes since last update to see if we should sleep
            current_time=$(date +%s)
            last_mod=$(stat ${filename} -c %Y)
            seconds_ago=$(expr $current_time - $last_mod)
            minutes_ago=$(expr $seconds_ago / 60)

            if [ "$DEBUG" = true ]; then
                echo "${device} old stat: ${stat_old}"
                echo "${device} new stat: ${stat_new}"
                echo "${device} new stat modified ${minutes_ago} minutes ago"
            fi

            if [ "${stat_old}" == "${stat_new}" ]; then
                if [ $minutes_ago -ge $SPINDOWN_DELAY ]; then
                    echo ${current} "- Drive /dev/${device} is awake and hasn't been used in ${minutes_ago} minutes; spinning down"
                    hdparm -y /dev/${device} > /dev/null 2>&1
                else
                    echo ${current} "- Drive /dev/${device} was last used ${minutes_ago} minutes ago, less than spindown setting ($SPINDOWN_DELAY)"
                fi
            else
                echo ${current} "- Drive /dev/${device} has been used..."
                echo ${stat_new} > ${filename}
            fi
        fi
    else
        if [ "$DEBUG" = true ]; then
            echo "${device} is asleep"
        fi
    fi
}

for device_id in ${drives[*]}
do
    do_device ${device_id}
done

 

 

I tried this script and I noticed that doesn't detect properly when the drive is being used and every time I try to run it the drives are spinning down and up.

I use unraid 6.12.6.

After further investigation I changed 

stat_new=$(grep "${device}1 " /proc/diskstats | tr -dc "[:digit:]")

to 

stat_new=$(grep "${device} " /proc/diskstats | tr -dc "[:digit:]")

In this way it search for ativity on the drive not partition and like this is working properly.