On Sat, 2020-06-27 at 14:15 +0200, Markus Schönhaber wrote:
26.06.20, 22:33 CEST, Patrick O'Callaghan:
> In other threads I've mentioned I have a USB-powered external SATA
> dock, which I'm using mainly as a backup device. Currently, I have a
> script to power it down by doing this sort of thing:
>
> echo 1 > /sys/block/sdd/device/delete
>
> I can then turn it on again using:
>
> echo "- - -" > /sys/class/scsi_host/host6/scan
>
> This works, but is a kludge. A cleaner way would be to use:
>
> udisksctl power-off -b /dev/sdd
>
> This works too, but unfortunately also removes the /sys/block/sdd
> files, meaning I can't turn the thing on again. However, if I
> physically switch it on and off, it reappears, IOW it causes a USB
> "insertion" event.
>
> Is there a way to cause an insertion event without physically doing
> anything to the dock?
eject -t /dev/sdd
might be worth a try. At least this (device node adapted, of course)
works for me with USB thumb drives which I "safely removed" using the
GUI. If the udiskctl command you use internally does something similar
to the GUI function, eject -t might also work for you.
The problem is that the device node (/dev/sdd) is removed by the
udisksctl power-off command, so this doesn't work.
Thanks anyway.
poc