>> I am trying to install an ultra-wide scsi drive using an adaptec
>> 2940UW (No, i'm not going to boot from it.)
>>
>> When I connect the drive, the system disk, which was at sd0 is
>> suddenly at sd1 and the drive on the adaptec card is sd0.  How do I
>> resolve this problem?  I worry about relabeling the system disk as sd1
>> if I need to remove the new disk.  Is the system disk on the wrong
>> internal scsibus (It's showing up as scsibus2)?
>
> This can be resolved by hardwiring the mappings between sd unit number
> and controller/target for the root disk.  This can be done like this:
>
> sd0 at scsibus2 target 0 lun 0	    # wire down root fs disk
>
> (you may need to tweak the target number) in addition to the customary
>
> sd* at scsibus? target ? lun ?	    # SCSI diskss
>
> By default, it scans the busses and targets in order, and numbers the
> drives sequentially.

I tried this and when I ran config I got the message;

accipitridae:229: sd0 at scsibus2 is orphaned

Do I also need to add;

scsibus2 at mesh0

??