On Wed, 2020-06-03 at 18:04 -0500, Roger Heflin wrote:
> you might be able to do this:
> 
> echo 1 > /sys/block/sdX/device/delete
> 
> 
> 
> that will remove the sdX device, to get it back you would need to
> 
> reboot or do a"
> 
> echo "- - -" to the "scan" device under the device that controls it to
> 
> bring it back.

I'll think about that, though I suspect I'll need to stop md first,
otherwise deleting one device at a time might make md think it needs to
re-sync.

> You may need to also use smartctl and/or hdparm (if this usb device
> 
> will pass the commands through)
> 
> to set the power down parameters on the disk so that it will power down.

hdparm lets me "unload" the disks but that doesn't power them down (the
man page says they will keep spinning).

poc
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