Re: Inhibiting device startup at boot

On Tue, 2020-12-01 at 14:52 +0100, Roberto Ragusa wrote: > On 12/1/20 2:15 PM, Patrick O'Callaghan wrote: > > I have a couple of SATA drives connected via a USB dock that I use only > > for backups. Normally they are powered down and only come on at night > > during the backup run. However they also power on any time I reboot the > > system and have to be powered down again manually. I'd prefer not to > > power them on at all until they're needed. > > > > Is there some magic that would inhibit the boot process from powering > > up these devices? Note that the /etc/fstab entry already has 'noauto' > > but that just prevents them from being mounted. > > How do you power them down? Extract from my script ($SLOT is sd[de]): smartctl --smart=off /dev/$SLOT1 -q errorsonly >> $LOG 2>&1 smartctl --smart=off /dev/$SLOT2 -q errorsonly >> $LOG 2>&1 echo 1 > /sys/block/$SLOT1/device/delete # Can't use udisksctl because it removes the echo 1 > /sys/block/$SLOT2/device/delete # bus, which can't be powered on again