Duplicate serial numbers with USB harddisks? (dfly 3.0.3)

[Thomas Nikolajsen]

Hi Thomas,

>I just put Dragonfly 3.0.3 on a spare box and at first connected a single USB
>HDD to it. After a while I connected two others (of the same type; different
>from the first one) and now I found this in dmesg output:
>
>umass1: <HitachiGST SimpleDrive III by Hitachi, class 0/0, rev 2.00/0.00, addr 2> on uhub6
..
>da9: Serial Number 801130168383
..
>umass2: <HitachiGST SimpleDrive III by Hitachi, class 0/0, rev 2.00/0.00, addr 3> on uhub6
..
>da10: Serial Number 801130168383

Seems like a known problem, please see:
http://leaf.dragonflybsd.org/mailarchive/users/2011-09/msg00024.html

Where Matt describes problem:
>..
>Most USB hard drives run through
>a USB<->SATA/Firewire bridge chip and most of these bridge chips can't
>handle serial number queries.
..
>I don't think there's a good solution for the usb serial number issue
>atm, other than to not use USB for any serious hard drive attachments.
>For a laptop which only has USB I guess there's no choice, and in that
>case you just have to hardwire it to /dev/da8 or something like that.

 -thomas