On Tue, 2020-12-01 at 13:15 -0700, Chris Murphy wrote:
> On Tue, Dec 1, 2020 at 9:39 AM Patrick O'Callaghan
> <pocallag...@gmail.com> wrote:
> >
> > 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
> >
>
>
> I've got a Seagate laptop drive inside an Intel NUC that is only
> storage (not system boot or root). And I use a udev rule.
>
> $ ls -l /etc/udev/
> hwdb.bin hwdb.d/ rules.d/ udev.conf
> $ ls -l /etc/udev/rules.d/
> total 12
> -rw-r--r--. 1 root root 139 Oct 7 17:47 60-block-scheduler.rules
> -rw-r--r--. 1 root root 179 Oct 7 17:36 69-hdparm.rules
> -rw-r--r--. 1 root root 628 Oct 29 06:40 70-persistent-ipoib.rules
> $ cat /etc/udev/rules.d/69-hdparm.rules
> ACTION=="add", SUBSYSTEM=="block", \
> KERNEL=="sd*[!0-9]", \
> ENV{ID_SERIAL_SHORT}=="WDZ47F0A", \
> RUN+="/usr/sbin/hdparm -B 100 -S 252 /dev/disk/by-id/wwn-0x5000c500a93cae8a"
> $
OK, I'll see if I can figure out what the hdparm options do.
poc
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