The simplest could be something like these,
https://www.amazon.ca/Powered-USB-Hub/s?k=Powered+USB+Hub.
11 (of the first 12) products are USB 3 hubs with individual port power
controls.
I have seen single-port USB cables with power switches, too, although I
don't remember where.
Your idea could be better, but these already exist.
Only some (although, *most* AFAIK) USB hub chipsets support turning
power on and off for individual ports. Under Linux you can use
https://github.com/mvp/uhubctl to control it. Nothing exists (that I
know of) under OpenBSD today.
You might also use a "smart" hub like those seen at
https://electronics.stackexchange.com/questions/393468/efficient-way-to-selectively-unpower-usb-ports
and port the necessary software to OpenBSD. (The ugen device driver
would probably be adequate, but it might be more of a rewrite than a
port. No idea how painful that would wind up being, I've never
programmed anything using ugen.)
Options exist, but it's possible none of them are *exactly* what you
want.
-Adam
On 2021-10-07 11:57, jeanfrancois wrote:
Ok thank both,
I might develop such device then, if other people interested I'd share
the product.
I'll be used to have backup / spare drives online for the work time
only;
Jean-François
Le 06/10/2021 à 16:36, [email protected] a écrit :
If nothing can be found software-side, a dedicated hardware
could possibly do it.
If it exists driver side, some tool like this could give a
hint for finding it on other operating system, and then comparing
with OpenBSD as well as getting the actual standard names for
that feature: https://github.com/mvp/uhubctl
Not really a solution, but rather a way to get a little
closer.
