Unfortunately no one can be told what fun_plug is - you have to see it for yourself.
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So -- I replaced my 250GB drives with 1TB drives with the intent of making a newer bigger filesystem.
I thought I saw something somewhere that allows me to grow the filesystem to fit the new drives -- but maybe I'm insane.
(I know the DNS doesn't have LVM -- so that's why I'm scratching my head)
Can anyone verify that I either need to just reconfigure (destructively or not) the array to use the new space?
Well, looks like ya can't.
So I had to reformat -- thankfully, reinstalling fun-plug is easy and since my DNS-343 is actually a backup, all I needed a copy of is the ffp config.
So -- the answer is: REFORMAT.