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How to put a HDD into low power mode in Linux

Tags: howto

I have an old spinning disk in my workstation used for the occasional backups and this thing is noiser and vibrates worse than the PC itself.

Today I had enough and wanted to get rid of this annoyance. Solution? Put the HDD into low power mode!
To do this is super easy, from a command line, as root run:

# /sbin/hdparm -y /dev/disk/by-id/ata-WDC_WD1003FZEX-00MK2A0_WD-WCC3F3TPK1DD

This only momentarily fixes the problem, we need to make sure the command is run also at boot and when resuming from sleep.

This can be achieved in various ways, but today we're going to employ systemd since we're modern like that.

1. First, run hdparm at boot, we do this by creating a new systemd service file, on my Fedora I do something like the following.. Obviously replace with your own paths.

# cat << "EOF" > /usr/lib/systemd/system/hdd-lowpower.service 
Description=Put HDD into low power mode

ExecStart=/sbin/hdparm -y /dev/disk/by-id/ata-WDC_WD1003FZEX-00MK2A0_WD-WCC3F3TPK1DD


# systemctl enable hdd-lowpower

2. Now let's sort out the same but when the PC wakes up from suspend to RAM (I think this also works when resuming from hybernation), we do this by employing the systemd-suspend.service (see man):

# cat << "EOF" > /usr/lib/systemd/system-sleep/hdd-lowpower.sh

if [ "${1}" == "post" ]; then
/sbin/hdparm -y /dev/disk/by-id/ata-WDC_WD1003FZEX-00MK2A0_WD-WCC3F3TPK1DD && logger -t hdd-lowpower "HDD is in low power mode"

# chmod +x /usr/lib/systemd/system-sleep/hdd-lowpower.sh

That's it, enjoy!
(c)The Nux(tm) ;-)

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