as koyi said, it depends what you mean by "linux 9".
There's quite a few distributions that are currently using the designation of "9" (and quite a few that have used it in the recent past).
If you mean something like Redhat 9, SuSE 9 (or is it 9.1 that's the current number) or even Mandrake 9.0 (but they've already also used 9.1 and 9.2, with the latest being 10 official) then the installation is usually pretty straight forward i.e. you can just make a single seperate partition for it and it will go into there, but if you want to get a bit "snazzy", then you can make multiple partitions and have root, swap, home, boot, var, and lot's of different ones - personally I make do with root, swap, boot and home).
As the linux world like's to say/point out, the choice is your's