Dnia 2010-01-28, czw o godzinie 10:13 -0500, Carlos Williams pisze:

Should I ignore the warning and proceed?

If you do - remount the filesystem read-only (mount -o remount,ro). But
it would be best to use some LiveCD system, otherwise you will need to
resize on a live filesystem, it will take much more time and is more
dangerous than resizing offline.

If you can't take the fs offline - you can force resizing without fsck
first, but again - it would be best to fsck it and resize offline.

-- 
Cheers
Michał (Saviq) Sawicz