My -current system:

sd0/scsi id 0: / | swap | /usr
sd1/scsi id 2: All Ados
sd2/scsi id 3: /src | Ados | Ados

I want to move Everything off sd0 to sd2 (moving /src as well).  My
question in what to mount /usr as in the fstab list after I dump
restore the system so it looks like:

sd0/scsi id 0: All Ados
sd1/scsi id 2: All Ados
sd2/scsi id 3: / | swap | /usr | /src

My question is:  After I change the OS type on the drive (via
hdtoolbox) will it boot off of sd2 or sd0?  I don't know if it takes
the first drive as sd0 then starts adding drives incrementally after
that or weather it will now boot off of sd2?

Tanx in advance,
Wes