Re: USB "insertion" for permanently-connected devices

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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.

-- 
Regards
  mks
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