Disk Label Problem

[Doug Hardie]

I have a system with two SCSI disks.  da1 has a complete working system 
on it that I need to clone onto da0.  The disks are different sizes.  
So I went to sysinstall and used 'disk label' to create the desired 
structure.  Thats where the problems started.  If I create the first 
partition and set the mount point to / and the second as a swap 
partition and the third to mount at /usr then when writing the changes 
there are a number of errors generated because it can't mount to those 
points - they are in use.  So then I tried to use 'disk label' and 
create the structure using /mnt and /mnt1 (which do exist).  That 
worked fine and did the newfs.  However, it created partitions d and e 
rather than a and d.  So I went back and reestablished the structure 
using / and /usr to set the partitions to a and d and then went back 
and changed the mount points to /mnt and /mnt1 before the write.  
However, this generated an error that it couldn't write label.

Obviously I am doing something wrong since I have don this using 
sysinstall and completing the system installation from CD.  However, in 
this case the machine is a long way away and the CD drive is empty.