Updating from 5.4-STABLE to 6.0-STABLE

[Anthony M. Agelastos]

Hello everyone,

I am preparing my system for syncing with 6.0-STABLE and updating it  
from 5.4-STABLE. In preparation, on the 6.0-RELEASE Announcement  
page, it lists that some of the changes since 5.4 include:

"Significant performance improvements to the filesystem and direct  
disk access layers of the OS. The filesystem is now multithreaded and  
can take full advantage of multiple CPU systems."

This makes it sound as if UFS2 has been updated from 5.4 to 6.0. If  
this is true, will updating from 5.4 to 6.0 give me these changes or  
will I have to reformat the drives with the updated UFS2? When  
FreeBSD 7.0 comes out, I expect it to have the UFS2+Journalling  
extension that someone worked on for the Google Summer of Code. When  
this occurs, is there an easy way of updating the filesystems? If  
there is no easy formatter that leaves the files in-place, what is  
the recommended method of relocating the files, then reformatting  
with the updated filesystem, then putting them back (I don't know if  
tar archives are appropriate for this, or what is recommended). Thank  
you all for your assistance in answering these questions. If I can  
get the exact same system from reinstalling 6.0 from scratch or  
updating from 5.4-STABLE, it would save me a lot of time in  
recompiling the ~400 Ports I have built for this system to just  
update. Any commentary on the issue is welcome. I have searched all  
of the relevant documentation I could find to no avail. If there is  
information posted somewhere on these topics, referencing me to them  
would be greatly appreciated.

-Anthony