hdd-idle.service

[Unit]
Description=HDD no-activity suspender
After=local-fs.target

[Service]
# suspend disks after roughly 4 minutes of inactivity
# remove HDDSDEBUG assignment to get the logs silent
Environment=HDDSUSPINT=250 HDDSDEBUG=1
ExecStart=/usr/local/sbin/hdd-idle
Type=simple
Restart=on-failure

[Install]
WantedBy=multi-user.target