a way to specify a specific scsi number at bioctl?

[elias r.]

Hi,
I've got a small server at my place which is running OpenBSD 4.5 on an 
eeebox.

The box has an internal card reader which is identified as sd0, then 
i've got /usr, /var and /home on a crypto-softraid device sd1 (bioctl -c 
C) and also an external backup disk (sd2) which has also an encrypted 
partition on it (sd3).

the problem is: if i reboot the server the usb-disk is identified as sd1 
and from this point on the device-numbering is going wrong...

is there a way to tell bioctl or the whole scsi-system that it should 
attach the device at a specific devicename?
(e.g. always sd2 for the backup-disk, always sd1 for the first 
softraid-device).


Greetings and Thanks!