growfs tutorial

[srenna at vdbmusic.com]

Hello all,

So I was reading this growfs howto

http://www.daemonnews.org/200111/growfs.html

I'm ready to give it a shot..however, i'm VERY concerned
about messing things up.  Here's the deal.  The example
here shows a fsize of 1024 while mine is 2048.  I'm
confused by the calculations as I'm not sure what to
modify.  Another thing, I cannot tell if this example is
being done with the next block of space available on the
disk or a block further up the line.  My situation is that
I want the new space to start after the 12G mark...anyone
had any experience in using growfs?