Would that be a video of you uploading an entire dvd to YouTube? Just kidding. Aren't there limits to what you can post? Is the intention that each part is playable on its own (which I'm sure is a requirement for YouTube)?
DVD, if you mean a proper dvd with menus, is mpeg2 which is not a great format for size. You should convert to an avi first (apps such as the freeware version of
DVD to AVI). If you don't have any editing tools you can use something like
Easy Video Splitter which allows you to split where you want or divide it up into so many parts.