Kernel mixup after dump/restore

[Patrick Bowen]

List;

I have a slice on ad0s1 mounting the root FS from ad0s2a, and 
vice-verse. Here's what I did.

1.  Started out with a 20 Gig drive with two equal slices, ad0s1 (blank) 
and ad0s2 (FreeBSD).

2.  Used sysinstalls fdisk and bsdlabel to create /, /var, /tmp, and 
/usr partitions on ad0s1 equal in size to those on ad0s2.

3.  Used the following command to copy partitions from ad0s2 to ad0s1;

           dump -L -0 -f- /usr | (cd /mnt/hd/usr; restore -r -v -f-)

     /usr is on ad0s2 and /mnt/hd/usr is ad0s1.

4.  Changed /mnt/hd/etc on ad0s1 to mount partitions on ad0s1, rather 
than ad0s2.

5.  Used grub to boot either to ad0s1 or ad0s2.

When I boot the first slice (ad0s1), df(1) shows all the partitions to 
be ad0s1, except root, which is ad0s2. When I boot the second slice 
(ad0s2), df(1) shows all partitions to be ad0s2, except root, which is 
ad0s1.

Can anyone explain this behaviour, and why it might have happened?

Thanks,
Patrick