I re-read that old, out-of-date guide -- it discussed a workaround for the MAXDSIZ limitation of the i386 architecture at that time. It's 3GB these days on i386, and 32GB on the now-far-more-ubiquitous amd64 architecture.
And the workaround discussed -- ccd(4) -- was long-obsolete and removed from the OS after release 4.9.
Be wary of out-of-date HOWTOs.
