On Wed, 14 Apr 1999, Michael G. Schabert wrote:

> go into installer's minishell.
> 
> mv usr oldusr
> mkdir usr
> mount /dev/sd1g /usr
> mv oldusr/* usr/

Yeah, that might save some time. It should work even better from the
single-user shell. (After mount -ur /).

> After all of that, you should have everything when you boot properly...but
> I don't remember offhand what the consequences are for using a full
> directory as a mount point...there's a possibility that your root
> partition's usr directory's contents have been deleted. (that's the main
> reason for the desire for a stable union filesystem)

It will still be there, underneath the mount point, safe and sound.
The reason I suggested deleting it was that it still takes up space,
and the HD in question only has a 130M root.