On Mon, 2021-06-14 at 11:10 +0100, Patrick O'Callaghan wrote:
> On Sun, 2021-06-13 at 14:38 -0600, Chris Murphy wrote:
> > I actually use a udev rule for idle spin down:
> >
> > $ 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"
> > $
>
> BTW, the reason I don't do this is that one of the drives doesn't
> accept the APM spin-down command:
>
> $ sudo hdparm -B 100 -S 24 /dev/disk/by-id/wwn-0x50014ee058f952e1
>
> /dev/disk/by-id/wwn-0x50014ee058f952e1:
> setting Advanced Power Management level to 0x64 (100)
> HDIO_DRIVE_CMD failed: Input/output error
> setting standby to 24 (2 minutes)
> APM_level = not supported
Turns out that the problem isn't with the -S but with the -B. I can
just set the standby time directly on this drive, so I'm going to try
your udev idea instead of my elaborate dock-watch workaround.
poc
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